Planting cucumbers in June are favorable days. Terms of planting cucumbers for seedlings, in a greenhouse and in open ground. Soil for seedlings

Here you can learn about which cucumber diseases cause the most damage to plants, and how to protect plants from infections. After reviewing the photo and description of cucumber diseases, you will be able to recognize the disease in a timely manner and take the necessary control measures.

Diseases of cucumbers in the greenhouse in the photo

Downy mildew (downy mildew). A widespread fungal disease of cucumbers, which is main reason premature death of summer crops of cucumbers, also affects cucumbers in greenhouses.

On the affected leaves, rounded or angular yellow spots appear, on the underside of which a grayish-purple coating of conidial sporulation of the fungus develops.

As can be seen in the photo, with this disease of cucumbers, the affected tissue becomes brittle and crumbles easily, the leaves wrinkle and fall off:

Downy mildew (peronosporosis) of cucumbers in the photo
With this cucumber disease, the affected leaf tissue shrivels and falls off (photo)

In closed ground conditions with high humidity, leaves affected by downy mildew rot.

During the summer, the fungus spreads by conidia, and then spores are formed in the affected tissues, in the form of which it hibernates. Fog, dew and moderate temperature (+16...+22°С) contribute to the development of the disease. The source of the disease is the remains of diseased plants.

To combat this disease of cucumbers, it is necessary to observe the alternation of crops, carefully clean and destroy plant debris. In greenhouses - it is necessary to maintain the optimum temperature (above +24 ° C) and humidity (within 80-90%).

For the prevention of peronosporosis (downy mildew), Profit Gold is used. When the first signs of the disease appear before fruiting, cucumbers are sprayed with one of the copper-containing preparations (Bordeaux liquid, Abiga Peak, Oxyhom, Khom, Ordan, etc.). Repeated treatments in case of resumption of the disease during the fruiting period are carried out with biological preparations Fitosporin-M, Alirin-B. Preparations for protection against downy mildew must be alternated. As you can see, it is not so difficult to fight this disease, the main thing is to recognize the disease in time and prevent its spread.

Powdery mildew in the photo. Fungal disease of cucumbers

Powdery mildew. Also a fungal disease. Initially, the disease appears on the upper side of the leaves in the form of individual white powdery spots, covered with a bloom of the mycelium of the pathogen. The spots are getting bigger; merging, they cover the entire upper side of the leaf.

With this disease of cucumbers in the open field and greenhouses, a powdery coating appears on the underside of the leaves, as well as on the petioles. Severely affected leaves dry up. In closed ground, the disease is also noted on fruits.

During the season, the powdery mildew pathogen is spread by spores with an incubation period of 3-4 days. In winter, the fungus survives on infected post-harvest residues.

The disease can reduce yields in open fields by up to 30% and in greenhouses by up to 60%.

In the treatment of this cucumber disease, plants can be sprayed with Topaz, and during the harvest period with colloidal gray, Thiovit Jet, Fitosporin-M or Alirin-B when the first signs of powdery mildew appear, and then at intervals of 7- 10 days.

Cladosporiosis (olive brown spot). A fungal disease that develops on cucumbers everywhere in open and closed ground. Cucumber fruits are mainly affected, but leaves and stems are sometimes affected. The first signs of cladosporiosis on fruits are small watery spots that quickly increase in size, reaching a diameter of 5 mm; the skin of the fruit cracks, quickly hardening gelatinous drops appear on the surface of the spot. At high humidity, the spots become covered with a black-green velvety coating.

Pay attention to the photo - with this disease of cucumbers in the open field and in the greenhouse, diseased fruits are bent:

Cladosporiosis of cucumbers in the photo
With Cladosporiosis of cucumbers, diseased fruits are bent (photo)

Scattered small brown spots surrounded by a yellowish border appear on leaves affected by olive brown spotting by the beginning of fruiting. The raid on them is dim, weak. On old leaves, the affected tissue falls out. On the stems, the disease manifests itself in the form of dry ulcers.

The causative agent of the disease develops at wide temperature ranges (+5...+30°C) and relative air humidity (from 35 to 100%), but a strong development of the disease is facilitated by a decrease in temperature at night to +16...+18°C at relative air humidity over 85%.

Measures to combat olive brown spotting include maintaining the optimal regime of temperature and humidity. If necessary, spraying plants with copper-containing preparations, as well as against peronosporosis.

These photos show cucumber diseases and how to treat them:

Root rot. The disease mainly affects cucumbers in greenhouses, it also occurs on plants in the open field. The disease of root rot is usually preceded by the weakening of plants under the influence of adverse external conditions.

On cucumbers in greenhouses, the disease manifests itself in the fact that the leaves, starting from the bottom, gradually turn yellow. Gradually, the plants wither. Browning of the bark is noticeable on the lower part of the stem and roots.

Look at the photo - with this disease, the stem is crushed in cucumbers in greenhouses.

Root rot (photo). The disease mainly affects cucumbers in greenhouses.
With the disease "root rot" in cucumbers in greenhouses, the stem is crushed

The disease usually occurs as a result of a decrease in soil temperature or an excessively high concentration minerals, as well as when watering with cold water. Lowering the air temperature in greenhouses to +17...+18°C contributes to the development of the disease.

The disease is more pronounced when sunny weather follows a long period of cloudy weather. The focal occurrence of rot is often observed in those places where the roof of the greenhouse leaks.

Similar signs of the disease are observed in plants in the open field, often after watering or heavy rain. At first, the leaves turn slightly yellow and tie. At the same time, the stem and roots have an outwardly healthy appearance, but there are no root hairs on the roots.

Here you can see a selection of photos of diseases and pests of cucumbers in greenhouses and open ground:

Fusarium wilt of cucumbers in the photo
Withering with Fusarium in the photo

Fusarium wilt. On the affected seedlings, the cotyledons wither or the lower part of the stem rots, as a result of which there is a mass death of seedlings. On adult plants, individual lashes first wither, and then the whole plant dies, often having a green color.

The causative agent of Fusarium wilt remains in the soil for a long time, and can also be found in infected seeds. It penetrates into the plant through young cells of root tissues, root hairs, grows into the tissues of the root collar; through wounds formed on individual lashes during pinching and other work. Inside plants, the mycelium of the fungus spreads mainly through tissue cells and blood vessels.

In the fight against root rot and Fusarium wilt, strict adherence to crop rotation, careful collection and removal of plant residues is necessary. The introduction of organic and mineral fertilizers, plant nutrition during the growing season, the destruction of the soil crust - after each watering, especially in the first period of growth.

Phosphorus-potassium fertilizers and wood ash reduce the intensity of the development of Fusarium wilt.

It is also necessary to disinfect the seeds by soaking them before sowing in the Fitosporin solution for 1-2 hours. When seedlings appear and during the growing season, water the plants with Gliocladin.

Heat and high humidity in a greenhouse is a dangerous combination for succulent stems and fruits, referring to disease-causing fungal spores.

Gray rot of cucumbers in the photo
Botrytis cucumbers in the photo

Gray rot (Botrytis). Cucumbers are mainly affected by it in greenhouses. The disease develops on various organs of the plant. This fungal disease causes especially significant damage by affecting the fruits.

It is possible to prevent large losses from gray rot, while observing the rotation of crops and maintaining the optimum temperature (not lower than +18 C) and air humidity (within 90%) in the greenhouse. It is necessary to remove rotten fruits and heavily affected plants from it.

Angular spotting (bacteriosis). Further development diseases will be restrained by the biological preparation "Gamair".

To protect cucumbers from diseases and pests, you should not:

• Overfeed the plants with nitrogen so that the stems and leaves are not soft and thin.
• Planting plants too densely: this makes it difficult for air to reach them. Damp stagnant air and tightness contribute to the development of diseases.
• Create a stale, stuffy atmosphere in greenhouses and greenhouses. Avoid cold drafts in winter. When ventilating, open windows on the leeward side.
• Injure plants and fruits, it opens easy access pathogenic microorganisms.
• Leave cucumber fruits affected by diseases and pests on the plant - destroy them immediately.

Pests of cucumbers in the open field and greenhouse, measures to combat them

Aphids in the photo
Aphids on cucumbers (photo)

Aphids are one of the most common and dangerous pests of cucumbers. It appears on young plants (at the stage of 3-4 leaves), and therefore the harm from it is especially noticeable. The leaves inhabited by aphids shrivel and curl, the growth of the shoot stops, the plant dies. With a later development of aphids under the influence of a pest, a curvature of the shoots, drying of flowers and ovaries is observed. These pests of cucumbers in the open field excrete polluting plants with abundant sticky sweet excrement, on which sooty fungi settle, which also aggravates the condition of cucumbers.

Aphids are quite large, up to 2 mm, clearly visible to the naked eye, black in mass. During the season, it develops in 15-20 generations (almost constantly there is a hatching of more and more new pest individuals). Moderate and humid weather favors the rapid reproduction of aphids.

Adult aphids overwinter on the leaves of weeds, most often on the shepherd's purse. In the spring they feed on weeds, later they fly to cucumbers. Aphid females are viviparous, their average fecundity is 25-60 larvae.

In the fight against aphids, as soon as it appears on the plants and before the fruiting of cucumbers, use spraying with one of the preparations (“Iskra-M”, “Iskra Zolotaya”, “Spark Double Effect”, “Confidor” or “Commander”). With repeated spraying, the preparations must be alternated so that the pest does not get used to them.

During the fruiting period, only biological preparations with a waiting period of 1-2 days can be used against aphids (Iskra Bio, Akarin, Fitoverm, Agravertin).

Spider mite in the photo
Spider mite on cucumber (photo)

The spider mite also causes severe damage to cucumber plants. A tick appears especially often if the air in the greenhouse is dry, this cucumber pest leaves light yellow spots visible to the naked eye in the form of injections on the underside of the leaves. If such spots are found, the plants are sprayed with garden or colloidal sulfur, you can use Thiovit Jet. Spraying is repeated after 7-8 days. During the application of sulfur-containing preparations, do not water the plants with sprinkling, so as not to wash them off the leaves. Sulfur preparations will also help cucumbers in open ground, where the spider mite colonizes plants in large numbers in July, August, when the heat is over +30 ° C at low relative humidity - 35-45%.

From biological preparations against spider mites good effect gives "Bitoxibacillin" and biological products recommended against aphids.

Radishes planted between cucumbers and tomatoes repel leaf beetles and spider mites.

Miners in the photo
Miners on cucumber leaves (photo)

Miners are pests that infect cucumbers in the open field during the fruiting period. With a large number of pests, use biological preparations, as against aphids.

If the cucumbers are sick. What to do? How to help plants and save the harvest? AT middle lane and in the northern regions, the summer is not long enough, so treatment should be started immediately, at the first sign of disease.

Control measures must be effective, including prevention and treatment.

anthracnose cucumber

It is expressed in rounded, blurry spots on the leaves of plants. The spots, increasing, merge, covering a significant part of the sheet, giving it a burnt appearance. Then the leaves turn brown, dry and crumble. Slimy orange pads form on the lashes and stems.

Control measures:

Compliance with crop rotation, burning of post-harvest residues; processing inventory and wooden parts of greenhouses bleach(200 g per 10 liters of water). When the first signs of the disease appear, the plants are treated with Hom (40 g per 10 l of water) or Colloidal Gray (40 g per 10 l of water).

white rot cucumber

AT causative agent (pathogenic fungus), affects all organs of pumpkin plants and manifests itself in the form of a white flaky coating, on which black dots subsequently appear. Plant tissues become soft and slimy, the plant wilts and then dies.

Control measures:

Treatment of diseased areas with crushed charcoal, fluffy lime or chalk; foliar plant nutrition ( 1 g zinc sulfate, 2 g blue vitriol and 10 g of urea per 10 l water). Treatment of plants with the drug "Hom" ( 40 g diluted in 10 liters of water). Sprayed only after harvesting the fruit.

The alternation of cultures. Placing cucumber after legumes, onions or cabbage;

white rot on cucumbers

- represents a danger to various plants during the growing season and during storage of the crop. Cucumbers are usually affected by this disease in greenhouses. White rot can develop on all parts of the plant - roots, stems, petioles, leaves and fruits.

When the above-ground organs are damaged, the tissues become soft, slightly mucilaginous, covered with a dense white mycelium, in which black sclerotia subsequently form. Plants wither, leaves lose turgor, dry up. The infection persists in the soil from year to year.

The causative agent of white rot is transmitted through the air, and is also transferred mechanically (from hands and tools). Infection occurs almost always through wounds.

The first signs of the disease usually appear when sharp decline air temperature up to (12-15°C) and its relatively high humidity (90-95%). The thickening of cucumber plantings, poor ventilation of greenhouses contribute to the development of the disease.

Control measures:

Soil disinfection: 50 g of copper sulfate is diluted in 10 liters of water. Spend 1 liter of the resulting solution per 10 m 2. Processing is done in spring and autumn after harvest. Removal of affected parts of plants. The optimum air temperature in the greenhouse (not lower than 18 ° C). Good ventilation. Watered in the morning.

Do not grow parsley and celery (for greens) in soil where cucumber will be grown. Plant better dill. Dill is an excellent predecessor and neighbor for cucumbers.

Downy mildew on cucumbers

downy mildew has become the most widespread dangerous disease in recent years. It can appear in any phase of plant development, starting from seedlings, but more often occurs in early August, that is, during the fruiting period. The infection persists in the soil for up to 6-7 years.

Signs of the disease: multifaceted green oily spots appear on the leaves, which increase in size within 8-10 days. The leaves turn brown, as if the plant was burned, and dry out within 2-3 days.

Gardeners often believe that this is the result of acid rain. In fact, such symptoms indicate an increased development of the pathogen, the cause of which, as a rule, is a sharp change in temperature during the day (25 ° C), and at night (1-14 ° C), watering with cold water or cold rain. Contributes to the spread of the pathogen and strong condensation on the film, which is why cucumber plants, especially in the greenhouse, are constantly wet. When the temperature in the greenhouse drops to (1-12 ° C) at night, an outbreak of this disease can be expected.

Control measures:

At the first signs of the disease, you should immediately stop watering and fertilizing, do not carry them out for 6-8 days. After reducing the humidity, the plants are sprayed with a solution of the Topaz preparation (2 ml per 10 l of water) or Hom (20 g per 10 l of water). The temperature of the solution should be (22-24°C). After treatment, it is necessary to quickly ventilate the greenhouse, but do not allow the temperature to drop in it during the day (20-25 ° C), and at night (18-22 ° C). At night, plants should be additionally covered with a film or other material to maintain this temperature. After 6-7 days, the treatment with Topaz should be repeated (2 ml per 10 liters of water).

From folk remedies - spraying cucumbers with a solution of whey (3 liters and 1 teaspoon of copper sulfate per 7 liters of water). Can be sprayed with undiluted whey.

After the last harvest, the plants must be treated with a solution of copper sulfate (50 g per 5 liters of water), and a day later, along with the roots, remove from the garden and burn.

Grow resistant cucumber hybrids.

Powdery mildew on cucumbers

powdery mildew- a disease very common in greenhouses and in the open field. It is expressed in the appearance of a white coating on the leaves, which spreads rapidly, as a result of which they become white (as if sprinkled with flour), then dry out, and the plants die. With the annual sowing or planting of cucumbers on the same bed, pathogens of this disease accumulate on it. They spread quickly when the temperature drops and watering with cold water. The disease can be transferred from weeds, flowers, etc.

Control measures:

Rotation of crops; deep autumn digging; removal of affected leaves, plant debris and weeds; maintaining temperature in greenhouses (20-25 ° C) and optimal humidity.

When the first signs of mealy plaque appear on the leaves, they must be sprinkled with a solution of mullein: ( for 10 liters of warm (25 ° C) water, take 1 liter of liquid mullein and 1 tablespoon of urea ). The solution should be well stirred, filtered and sprayed on the leaves in the morning in warm weather. Leaves should be processed from the sprayer both from the bottom and from the top.

Pollination of plants with finely ground sulfur helps. To do this, sulfur is poured into a bag of three-layer gauze and plants are pollinated during the day in sunny weather at an air temperature (23-28 ° C). When processing in a greenhouse, it is necessary to close the windows and doors, and cover the cucumbers in the garden in the open field with a film for 2 hours.

A good result is obtained by spraying plants with a solution of potassium permanganate (1.5 g per 10 liters of water).

An effective method against powdery mildew is spraying plants with a solution of Colloidal Sulfur (40 g per 10 liters of water). Processing is carried out in cloudy weather.

A more reliable way to combat powdery mildew on cucumbers is to spray with Topaz (2 ml per 10 liters of water). To do this, take 1 ampoule (2 ml), dilute in 10 liters of water (room temperature), stir and pour into a fine spray sprayer. Spraying is carried out both at the first signs of the disease, and for prevention.

Spray cucumbers 2 times. The first spraying is carried out when 8-10 true leaves appear, the second - at the beginning of flowering (about 10-12 days after the first). Cucumbers are processed both in film greenhouses and in open ground in calm, calm weather, preferably in the morning, evenly wetting the leaves.

Good results are obtained by spraying the plants with the Zaslon solution (3 caps per 1 liter of water) or the Hom preparation (40 g of the powder is diluted in 10 liters), spraying 1 liter of a solution of 10 m 2.

Brown (olive) fruit spot

It spreads when watering with cold water by sprinkling, that is, over plants, at high humidity and sharp decline temperatures day and night to (10-13 ° C), as well as with a draft. All this weakens the plants. The causative agents of the disease persist with poor disinfection of the soil and the roof of the greenhouse, on plant waste and infected fruits.

The disease appears on the fruits in the form of brown sores with the release of fluid. Ulcers cover the entire fruit, and it becomes unusable. The disease can destroy the crop along with the plant in 6-8 days.

Control measures:

At the first signs of the disease, it is necessary to stop watering for 5-6 days, carry out airing on warm days, that is, open all the windows, doors or remove the film from the garden. In the cool period, on the contrary, close everything in order to raise the temperature in the plant zone during the day to (20-25 ° C), and at night at least to (18-20 ° C).

Fruits and plants are treated with a 1% solution of Bordeaux liquid or Hom preparation (20 g per 10 l of water). Spray plants only with a sprayer, and not from a watering can and not with a broom, in warm weather (up to 11 hours) 2 times with an interval of 5-6 days. Immediately after spraying, the plants are dried, for which the windows are opened on one side. Grow cucumber hybrids that are resistant to this disease. Affected cucumber fruits should not be eaten, they must be thrown away.

Gray mold on cucumbers

Gray rot- appears on cucumbers in the form of slimy gray spots on the stems, especially at the branches, in the axils of the leaves. It spreads with night drops in temperature, watering with cold water, dense plants and poor ventilation. With a strong thickening of plants, a huge number of male flowers appear. In the axil of one leaf, there are up to 10-15 empty flowers, which, as a rule, fade and rot in a few days, affecting healthy stems.

Control measures:

Grow self-pollinating cucumber hybrids. Avoid thickened sowing, and if there are many empty flowers, then after flowering they are removed, the affected areas are sprinkled with wood ash or crushed charcoal. It is necessary to ventilate the plants and wait a little with watering. When watering or top dressing, do not pour over plants. Dust diseased plants with the mixture :( 1 teaspoon of blue vitriol, 1 cup of wood ash and chalk) mix well and sprinkle on sore spots of plants. If the disease progresses, then severely damaged shoots are cut and burned. Treated with the drug "Hom" ( 20 g per 10 liters of water) or the preparation "Barrier" ( 3 caps per 1 liter of water).

Ordinary mosaic (VOM-1) on cucumbers

With a viral disease of cucumber, light green spots appear on the leaves, alternating with dark green, as well as swelling, which causes the leaf to become corrugated. Bloating, mosaic coloring and tuberculate formations also appear on the fruits. The infection persists in rhizomatous weeds and partially in the seeds of damaged plants.

Control measures:

For sowing, do not use your own seeds, but purchase branded, heated and processed seeds. If diseased plants are found, they are removed, inventory and containers are disinfected in a solution of potassium permanganate or bleach. There should be no weeds around the greenhouse.

Fusarium wilt of cucumber

Fusarium wilt- a fatal disease, common when grown mainly in greenhouses.

The first signs are wilting of the top or individual leaves of the plant. Wilting is accompanied by rot of the basal part of the stem. During the flowering period and at the beginning of the formation of fruits, the root collar and roots of diseased cucumbers turn brown, their bark cracks and rots. On the transverse section of the basal part of the stem, a ring of browned vessels is visible.

In wet conditions a pink coating appears on the stems of diseased plants near the soil surface. It contains colorless pink conidia. The pathogen enters the plant through root hairs and root wounds. The disease is dangerous at soil temperatures below (10-15 ° C). The main source of cucumber infection with Fusarium is the soil, where the fungus enters with plant residues and can persist for a long time. The pathogen is seed-borne.

Control measures:

Soil disinfection. Seed dressing. Destruction of severely affected plants. Optimum temperature and humidity in the greenhouse. Watering plants with warm (22 ° C) water.

Cucumber necrosis (Click on the picture to enlarge).

Necrosis – infectious disease caused by a lack of nutrients in the soil. The most common cause of leaf tissue death is a lack of phosphorus, potassium or manganese.

With a lack of phosphorus, the leaves, primarily old, yellow, prickly, acquire a bluish-green color with a purple tint, then brown, irregularly shaped spots begin to form on them. Affected plants have no shoot growth, they bloom weakly or do not bloom at all.

Potassium deficiency on the cucumber is manifested as yellowing of the leaf edge, which subsequently dies off and turns brown. The lower leaves are affected first, then the upper ones.

With a deficiency of manganese, the tissue between the veins, as a rule, starting from the top of the leaf, becomes necrotic. Dead tissues are almost white or light brown. The lower leaves are affected first.

The lack of these elements is usually noted in peat soil.

Sometimes the cause of necrosis on a cucumber is sunburn, sharp fluctuations in temperature day and night.

Control measures:

Feeding plants with missing nutrients.

With a lack of phosphorus: ( 2 tablespoons of superphosphate diluted in 10 liters of water), watered with 2-3 liters of solution per 1 m2.

With a lack of potassium: ( 2 tablespoons of potassium sulfate diluted in 10 liters of water).

With a lack of manganese: ( 1 g of potassium permanganate is diluted in 10 liters of water).

Cucumber bacteriosis

A common disease of cucumber, melon, pumpkin. It develops on cucumber both in protected and open ground, affecting cotyledons, leaves and fruits. Watery spots appear on the cotyledons, which subsequently dry out and turn brown.

Sometimes the affected seedlings die. Angular dark green oily spots protrude on the leaves. Later they become grayish-brown, the tissue in this place crumbles, the leaf becomes perforated and dries. Droplets of liquid often appear on the spots. When dried, they turn into a film. On the fruits, on the stems and petioles, small rounded ulcers are formed. In places of spots, the growth of fruits is delayed, and they are bent. In diseased fruits, seeds are also affected.

The development of bacteriosis is facilitated by increased humidity and air temperature, and the presence of water droplets on plants. The infection persists on plant debris, inside and on the surface of the seeds.

Control measures:

Destruction of plant debris. Disinfection of greenhouse soil. Crop rotation. Destruction of diseased seedlings. Nutrient processing. Spraying plants with fungicides. It is sprayed 20 days after germination with the Hom preparation (20 g is diluted in 10 liters of water), 1 liter of solution per 10 m2 is consumed. Spray during fruiting bacterial preparation"Barrier" (3 caps per 1 liter of water). Repeat spraying after 6-7 days. With a strong development of the disease, only the soil is occasionally moistened with water.

white mosaic cucumber

white mosaic- an infectious disease that can appear on young leaves in the form of light yellow rings and star-shaped spots. In the future, the spots become greenish-white, when they merge, the entire leaf turns white or yellow.

Sick plants are depressed, with small leaves. Few female flowers develop on them, the fruits are small, ugly, with a mosaic white color, often tuberculate. Sometimes plants die prematurely.

White mosaic develops more strongly at a temperature (35°C) and with dense plantings. The causative agent of the disease is transmitted with plant sap during care, harvesting, and also when using freshly harvested seeds.

The causative agent is preserved in the peel and germ of seeds, plant residues, on inventory and in the soil.

Control measures:

Destruction of plant debris. Disinfection (see: White rot of cucumber). Optimum planting density. Growing hybrids. Destruction of diseased plants. Tying plants with new twine. Compliance with the temperature regime (up to 30 ° C) in the greenhouse.

Cucumber root rot

root rot- affects cucumbers in any phase of development. Symptoms of the disease often appear at the beginning of fruiting. First, single brown spots form on the lower stems near the roots, which subsequently merge, the tissue in these places turns brown, rots, macerates, then the roots are affected.

Due to the lack of water and nutrients, the leaves, primarily the apical ones, turn yellow (the veins remain normal green). Before or during fruiting, cucumber leaves wither. This is especially noticeable in sunny weather after a long cloudy weather. The disease is more pronounced with a sharp fluctuation in temperature day and night.

On the lower part of the stem, the fungus forms a brown coating, which spreads rapidly during the growing season. Mushrooms overwinter in the soil or on the remains of roots.

Control measures:

Soil disinfection. In autumn, after harvesting and before planting seedlings or sowing seeds, the soil is treated with Hom (40 g per 10 liters of water), 2 liters of solution are consumed per 10 m2. When planting seedlings in the hole, only the nutrient pot is buried, without falling asleep the stem of the plants. During the summer period, the earth is not poured to the stems of plants, that is, they are not spudded. Violation of this rule leads to plant death. If a disease is detected, you need to rake the earth from the stem to the very roots and prepare the following “medicine”:

• (for 0.5 l of water, take 40 g of the Hom preparation, then half a teaspoon of the Bud preparation and 3 tablespoons of chalk, or fluffy lime, or wood ash),to stir thoroughly. Using a brush, moisten the affected part of the stem well with this solution (from roots to a stem height of 12 cm).

Sore spots can also be powdered with crushed coal, ash, chalk, dry well. When watering, try not to spray a jet of water. Water only the soil and make sure that the soil does not cover the diseased part.

Cucumbers can be watered only with warm (24-25 ° C) water and always in the morning, before 11 o'clock (in the greenhouse).

Dead plants are dug up along with the soil and burned, and the hole is watered with a solution of copper sulfate ( 30 g per 10 liters of water) or a solution of the drug "Hom" ( 80 g per 10 liters of water) at the rate of 0.5 l per well. Cucumbers are fed with organic fertilizer "Barrier" ( 5 tablespoons diluted in 10 liters of water). Spend 1 liter of solution per plant, watered under the root.

DO NOT WATER PLANTS WITH COLD WATER.

Blackleg

The fungi that cause this disease affect most vegetable crops, including cucumbers.

Cucumber seedlings, the roots of which are affected, turn yellow in the phase of cotyledon leaves, their root collar turns brown, and a constriction forms on it. In this case, the lower part of the stem becomes dark green, weeping. The roots of plants darken, become rotten, the lower leaves turn yellow and wither.

Infection occurs through the root system. Fungal infection penetrates into small cracks in the bark and through root hairs. These fungi are able to exist on plant residues in the soil, which ensures their accumulation in the soil with a permanent cucumber culture. In addition, peat, manure, seeds can serve as sources of infection.

Fungi cause rapid lodging of seedlings and seedlings when the air temperature drops to 12-15°C. The development of the disease is accelerated by a sharp fluctuation in soil temperature and watering plants with cold water (10-12 ° C).

Control measures:

Soil disinfection. 3 days before sowing or planting seedlings, the soil is treated with Colloidal Gray ( 40 g per 10 liters of water), spend 2 liters of solution per 10 m2, or a 1% solution of Bordeaux mixture. After treatment with Bordeaux liquid, the bed is sprinkled with river sand with a layer of 1 cm. The optimum air temperature in the greenhouse (not lower than 20 ° C). Plants are watered only with warm (about 22-24 ° C) water.

Before planting or sowing seeds, the Barrier preparation is added to the well: 1 tablespoon per well, mixed with soil.

Symptoms of the disease appear as small light green spots on the lower leaves. Such leaves quickly wither, as bacteria, spreading in the conductive vessels of the leaves, petioles and stems, clog them. The leaves begin to darken and dry out, while the stems remain green. Their vessels are filled with bacteria.

Water spots appear on the surface of the stems, over time, the fabric in these places dries and cracks. The rind of the fruit is depressed in places, brownish, and yellowed points of vessels are visible in the pulp on the transverse section. Bacterial wilt appears more quickly during flowering and fruit formation. At high temperatures and high humidity in film greenhouses, diseased plants wither within three to five days.

Bacteria are spread by insects (mainly leaf-eating and sucking pests). Infection occurs only through mechanical damage to the integumentary tissue (during pruning, pinching).

Control measures:

Disinfection of the soil in the greenhouse. Destruction of the first diseased plants. Spraying with insecticides against insect vectors. Against aphids, whiteflies, plants are treated with the drug "Confidor" ( 1 ml per 10 liters of water), spend 1 liter of solution per 10 m 2. After the last harvest, the cucumber is treated with Hom ( 40 g per 10 l water). Then the tops are removed and burned.

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An experienced gardener, thinking about growing cucumbers, first studies better ways cultivation and the possible difficulties he will have to face. One of the possible obstacles to obtaining a high yield is cucumber diseases. We will consider the most harmful of them, the causes and methods of treatment.

Causes of diseases

1. soil and air temperature. Cucumber is a plant of a tropical climate, very sensitive to temperature changes and does not tolerate frost at all. At temperatures below +15 degrees, it stops growing and is in a state where the accumulated nutrients per day, are completely spent at night only for the maintenance of basic life processes. With a long stay of seedlings at temperatures below +10 degrees, life processes stop and it dies. Heat also unfavorable. When +30 degrees is exceeded, the formation of substances that accumulate energy for growth is inhibited. Since in both cases there is not enough energy, the tissues become susceptible to many infections. Therefore, it is necessary to maintain the optimum temperature of air and soil + 22 ... + 28 degrees

   Mistakes in care often lead to diseases of cucumbers

2. Soil moisture. Low soil moisture does not allow obtaining nutrients, as they enter through the roots only in dissolved form. Despite the fact that the formation of cucumbers requires a sufficiently high amount of water in the soil, its waterlogging adversely affects the roots. Water, displacing air from the soil, leads to oxygen starvation roots. Infectious diseases of cucumbers are mainly active in water, so roots that are stressed due to lack of air are also susceptible to damage. It is necessary to maintain optimal soil moisture, which is determined either by a special device - a moisture meter, at a level of 75–85% of the maximum, or “by eye” - the soil in the hands does not crumble when compressed and does not smear when rubbed with fingers.
3. Air humidity. For the growth of cucumbers, an increased humidity of the ambient air is needed in the range of 75–85%. measured with a hygrometer. At a relative humidity below 60%, there is a strong evaporation of moisture from the leaves, which consumes a lot of energy, cucumbers begin to grow more slowly, immunity is weakened. If the air humidity is within 100%, then with sharp fluctuations in temperature, dropping moisture - dew is possible, which is the "gateway" for most infections.
4. mineral nutrition. Top dressing with the main elements of nitrogen, phosphorus and potassium should be carried out once a week during fruiting. With an excess of nitrogen, the plants become emaciated and they are susceptible to infection. With a low nitrogen content, growth weakens, which reduces immunity.
5. genetic stability. The absence of such genes makes seedlings susceptible to disease, so modern cucumber varieties that are genetically resistant to common diseases are recommended.
6. The presence of an infection. A source of infection is necessary for the manifestation of the disease. They may be the following:

• plant remains from the previous year. It is necessary to observe crop rotation or steam the soil of the greenhouse;
• wild weeds that are vectors. They must be destroyed;
• infection inside and on the surface of seeds. It is necessary to warm the seeds and treat with fungicides before sowing;
• rain containing spores pathogenic disease, therefore it is better to grow in a film or glass greenhouse;
• nearby infected seedlings. They must be removed immediately and the soil disinfected.

Having studied the causes of diseases, let's move on to their description and control measures.

Viral diseases of cucumbers and their treatment + photo examples

A feature of these diseases is the presence of a living host-carrier. Viruses do not live very long outdoors, but they are easily transferred during harvest or juicing. It differs from other diseases in that the color of the leaves of individual sections changes in the form of a mosaic. At the same time, the leaf is deformed, wrinkled, and the manifestation is asymmetrical, which distinguishes them from signs of an overabundance of the use of growth stimulants, which appear almost the same, but symmetrically. Consider the manifestation of the most common viral diseases.

Viral diseases are often seed-borne. The virus can be neutralized by heating dry seeds before sowing at a temperature of + 50 degrees for three days, and then a day at +70 degrees. If a plant with a virus is noticed, then it is immediately uprooted, and the soil is watered with boiling water. To exclude infection from weeds, they are destroyed around the cucumber planting at a distance of at least 10 m.

Video about the fight against diseases of cucumbers in the open field

Bacterial diseases affecting the leaves and fruits of the plant

Angular spotting

It is caused by bacteria that penetrate through the stomata of the leaves or damage to the integumentary tissues. Other plants of the pumpkin family are also affected, which can be reserves of infection. The main source of infection are seeds, in which bacteria can survive for about 2 years, and they quickly die in the soil. The incubation period is up to 10 days. Bacteria are carried by air masses and hands, when caring for the beds. The manifestation of the disease begins with the lower leaves, angular brown spots are formed on the leaves of cucumbers from the upper part and an oily yellowish coating from the lower part of the leaf. Affected fruits have small round sores. The leaves gradually dry out, the planting completely dies.

One of the types of bacterial disease

To combat a bacterial disease, the use of antibiotics is necessary, but there are no drugs developed specifically for this. Perhaps a single use of penicillin at a concentration of 1 million units. per 10 liters of water when the first signs of the disease appear.

Gray rot

Caused by bacteria, under cool conditions. All aerial parts are affected, brown areas appear and dense gray coating on cucumbers. The disease will spread quite quickly. The period from infection to the onset of symptoms is 3-5 days.

So the cucumber attacks the spider mite

To cope with the disease, stop watering, ventilate the greenhouse well, lubricate the affected parts with a pasty mass prepared from Rovral or Euparen multi.

What are the ways to deal with it in the greenhouse: video

Fungal diseases of cucumbers and their treatment

The most common and harmful diseases are caused by spore-bearing imperfect fungi. Cucumber has very delicate integumentary tissues, therefore it is easily affected various types this infection. To prevent infection from plant residues, cucumber should not be grown two years in a row in the same place.

Root rot

Cause fungi that are everywhere in the soil, feeding on inanimate plant debris, healthy seedlings are not affected. They arise only at the moment of weakening of plants, mainly due to low soil temperatures below +16 degrees. The root loses living root hairs, becomes covered with a brown coating, leaves and stem wither.

The root becomes brittle, the plant is crooked, wilting is observed

When buying seeds, you can see that some of them have already been processed and painted in a bright signal color. This is done to kill some of the infection on the surface of the seeds, and give a noticeable color, which makes it easier to sow, as they become more visible. Usually covered with a shell containing the fungicide tiram, which suppresses fungi that cause root rot. If the disease begins to appear, then it is necessary to raise the temperature of the soil by pouring warm water with the addition of an old folk remedy - potassium permanganate (to a faint pink color). The stems, lowering from the support, are laid on the ground and sprinkled with soil to form additional roots.

White rot or sclerotinia

A highly infectious dangerous disease that manifests itself in the form of white flakes with black dots on all parts of the plant. Mucous soft spots appear on them. Above-ground parts wither and die within 3-5 days. Effective drugs currently does not exist. When this disease of cucumbers appears in the greenhouse, it is closed for quarantine with the destruction of all plant residues and the treatment of the soil with steam or its replacement.

Anthracnose, ascochitosis, cladosporiosis: brown spots on seedlings and adult plants

Ascochitosis manifests itself quite quickly

These fungal diseases are similar symptoms, mainly brown spots appear on cucumbers. The affected leaf tissue crumbles and holes appear. The affected areas of brown color appear on the fruits. The plant eventually loses leaves and dies. The spores of these fungi overwinter on plant debris and are carried from infected plants to healthy ones by the wind. These diseases have an incubation period and begin to appear on the 3-7th day from the moment of infection.

To combat diseases, it is necessary to carry out preventive treatments with one of the copper preparations: 1% Bordeaux mixture, abiga-peak, copper oxychloride. Stop using these fungicides 30 days before harvest.

Powdery mildew

A fungal disease that manifests itself at high humidity, often after prolonged precipitation. The disease manifests itself 3-5 days after infection with spores. A white coating appears on cucumbers only on the upper part of the leaves. They gradually shrivel and then dry out, the seedlings stop growing and die.

A classic example of powdery mildew on cucumbers

To combat this disease, drugs containing sulfur are used, for example, Quadris or Colloidal sulfur. Processing is carried out prophylactically every 2 weeks and stopped 14 days before harvest.

Video: powdery mildew story

Peronosporosis

The second name is downy mildew of cucumbers. The most harmful disease, since the defeat is lightning fast and enough effective means there is no struggle. The spores of this fungus have flagella that pierce even thin aluminum foil. For infection, drip-liquid moisture is needed. Optimal infection conditions +18 degrees and 100% relative humidity. Peronosporosis of cucumbers manifests itself in the form of a whitish bloom with a purple tint on both sides of the leaf, which is hallmark from powdery mildew. The fruits become incompletely colored and tasteless. The leaves quickly turn brown and wither, the crops die completely.

Until recently, it was only possible to grow cucumbers early term maturation. Currently, the cultivation of resistant or tolerant varieties allows you to get a crop even in open ground. In greenhouses, cucumbers are less susceptible to disease during preventive treatment with copper preparations and alternation of preparations of various chemical groups, for example, Strobi, Ridomil Gold, Bravo. Processing stops 30 days before harvest.

We hope that the information presented in the article will help to avoid many diseases of cucumbers and get a high yield.

Diseases of cucumbers in greenhouses and open ground are numerous and varied. In greenhouse conditions, they are much more common and their harmfulness is much higher than in open ground. How to prevent the disease and cure already diseased cucumbers is described in detail in this article.

Powdery mildew or ashtray The disease manifests itself on the leaves of cucumbers. The disease is very harmful to greenhouse cucumbers, where it spreads instantly. In open ground it is less common and spreads less rapidly. The causative agent is the pathogenic fungus oidium, it belongs to a different order than the causative agent of powdery mildew on currants and gooseberries. The pathogen overwinters on plant debris. Infection can occur throughout the season. Primary foci appear at doors and vents, in open ground - in the most humid and shaded places. The disease of cucumbers spreads very strongly at high humidity and strong temperature drops in the greenhouse. On the street, the first foci appear 3-4 days after heavy rains. Another name for the disease is ashtray. Description of the disease. A white coating appears on the leaves, stems and petioles, which spreads rapidly. The spots gradually merge and darken, becoming a dirty gray or ashy color. The leaves become wavy, their edges are bent down and gradually dry. After a few days, the affected leaf dries up, and the disease passes to the upper leaves. With a strong spread, individual lashes first dry, and then the whole plant dies. Zelentsy are not affected by ash, but with the development of the disease, they become smaller and become bitter. The spread of the disease is facilitated by sharp fluctuations between daily and night temperature, as well as prolonged cold snap and dampness. Treatment of the disease Treatment of cucumbers in the greenhouse should begin immediately. At the first signs of the disease, cucumbers are sprayed with any of the drugs: Ordan, Quadris, Topaz, Bayleton, Topsin-M, Tilt. After 14-20 days, re-spraying is carried out (the specific period depends on the period of the protective effect of the drug). It is better not to use colloidal sulfur and preparations based on it on cucumbers (and other pumpkins). Firstly, they are not used in cold weather (at temperatures below 20 ° C), since in such conditions the drugs are ineffective. Secondly, at the slightest excess of concentration or in sunny weather, severe burns occur on leaves and lashes. The use of the Alirin-B biological product at an early stage of the development of the disease. It is non-toxic, and greens can be harvested 2 days after processing. When treating plants, they are never sprayed twice with the same preparation, since the pathogen develops resistance extremely quickly. Folk remedies for the treatment of the disease Spraying cucumbers with milk or kefir (1 l / 10 l of water). Lactic and lactic acid bacteria are antagonists of pathogenic fungi and inhibit their growth and development. Iodine treatment. 10 ml of a 5% alcohol solution / 10 liters of water. Carry out a double treatment with an interval of 7 days. Both iodine and alcohol are antiseptics and cause the death of pathogens. Effective at the initial stage of the disease. A strong solution of potassium permanganate is dark pink. Carry out 3-fold processing. Treatment with soda ash. 1 tbsp diluted in 2 liters of water, soap is added as an adhesive and cucumbers are processed. Whatever means of struggle are used, the affected leaves must be cut off and burned. Prevention Cleaning of all plant residues. Disinfection of greenhouses before sowing seeds. Removing weeds around the perimeter of greenhouses or cucumber beds. The causative agent can persist on them. Cultivation of resistant varieties: Boy with a finger, Geisha, Gostinets, Darling, Crocodile, Murashka, Octopus. Cucumber varieties completely resistant to powdery mildew have not yet been bred. Downy mildew or downy mildew Disease on the leaves of cucumbers in the greenhouse. The causative agent is the peronospore fungus. differs from the real one in that its mycelium (mycelium) develops from the underside of the leaf, and spots appear on top. The spots themselves, unlike the ashtray, are yellow or brown. The disease is more common in greenhouse cucumbers. Its spread is facilitated by high humidity and cold nights. More often appears in late July-early August, but may appear earlier. It remains in the soil for 6-7 years. Signs of defeat. The disease manifests itself on the leaves of cucumbers. Numerous irregularly shaped yellow-oil spots appear on the upper side of the leaves. Within 5-7 days, the spots enlarge and turn brown. On the underside, the mycelium is a white-purple bloom. The leaves dry up within 2-3 days. If the disease on cucumbers is not treated, then in a week it can destroy the entire greenhouse. Ways to treat the disease Stop watering and ventilate the greenhouse well. Remove all affected leaves. Sprinkle the soil under the plants with ash to prevent the spread of the pathogen. Treatment with Previkur, Consento, Revus. Use of preparations containing copper: Abiga Peak, Ordan. Bordeaux mixture in the fight against peronosporosis is ineffective. Spraying with biological products: Trichoderma, Gamair. Folk methods of struggle Spraying with a bright pink solution of potassium permanganate. 25 g of soda ash is dissolved in 5 liters of hot water, 5 g of tar soap is added. Spray cucumbers in the initial stage of the disease. All sprays are carried out on the underside of the leaves. Prevention If cucumbers are planted in the same greenhouse from year to year, then the spores of the fungus accumulate there in large numbers. Remove early in spring upper layer soil, replacing with fresh soil. Preventive spraying of cucumbers with biopreparations Fitosporin and Gamair. The interval between treatments is 5-7 days. Growing peronosporosis resistant varieties: Affin, Golubchik, Octopus, Pekti, Crew. Prevention is enough effective method. It reduces the risk of developing the disease on cucumbers in the greenhouse by 1.5-2 times. Bacteriosis or angular spotting The causative agent is a bacterium from the genus Pseudomonas. Preserved on plant debris and in seeds. The development of the disease contributes to high humidity and temperature. More often it affects greenhouse cucumbers. In closed ground, it is impossible to water the culture with rain, as drops of water on the leaves contribute to the spread of infection. Description of the disease The disease affects leaves, fruits and seeds. The disease on cucumbers can appear during the entire growing season, including in the seedling phase. The disease appears on the leaves, and then passes to the greens. If cucumbers are not treated, plants die both in the greenhouse and in the open field. How to treat bacteriosis Despite the fact that the causative agent of the disease of bacterial origin is treated with fungicides (antifungal drugs). They are quite effective. Copper preparations are most effective against bacteriosis: Kuproksat, Bordeaux mixture, Abiga Peak. Zelentsy then can not be eaten for 20 days. Use of the biological product Fitolavin. It belongs to phytoantibiotics (biobactericide) and completely destroys the pathogen. To prepare a working solution, 2 ml of the drug is diluted in 1 liter of water, the consumption rate is 10l/100 m 2 . The solution is used only fresh, it is not stored. In top dressing, increase the dose of potash fertilizers or make additional potash top dressing. Effective folk remedies do not exist. Prevention When the first signs of illness appear on cucumbers, watering is reduced, and greenhouses are constantly ventilated. Air humidity should be reduced to 80-85%. Air, soil and plants must be dried. Collection and destruction of plant residues. If a bacteriosis has appeared in the greenhouse, then it is advisable to replace the earth in the fall. Anthracnose The disease usually accompanies bacteriosis. It affects all above-ground parts of the plant: leaves, lashes, greens. It appears in the second half of summer, greenhouse cucumbers are especially affected by anthracnose. The causative agent is a fungus that survives on plant debris. Signs of illness. Initially, the disease affects the leaves. Blurry rounded brown spots appear on them, which then merge. Most of the leaf takes on a burnt appearance. and crumble. Orange-colored mucous pads may appear on the lashes and stems. Leaves of cucumbers with anthracnose. Later, anthracnose affects young greens. Brown sores with hard edges appear on them. They are very similar to the pecking of birds. Affected cucumbers are unsuitable for food. Treatment of the disease The fungus especially affects cucumbers in hot and humid summers. In the greenhouse, the culture is sick more often than in the open field. At the first sign of the disease, the affected parts of the cucumbers are removed and burned. At an early stage of development, treatment with biological products is quite effective: Alirin B, Fitosporin. Spraying cucumbers with copper preparations. It is advisable to do preventive spraying after the appearance of 5-6 leaves. Then the probability of anthracnose damage to cucumbers is significantly reduced. Copper has a good healing effect, but after processing, greens should not be eaten for 20 days. Simultaneously with spraying, watering is also carried out with the same preparations, since the pathogen persists on the soil and on the lower yellowed and fallen leaves. Prevention Disinfection of greenhouses in autumn. Set on fire in the greenhouse sulfur checker, and 3-5 days after that, the earth is shed with copper sulfate (1 tablespoon per 10 liters of water), or a dark raspberry solution of potassium permanganate. You can sprinkle the ground with bleach, and after a week dig a shovel onto a bayonet. But this should be done only in the fall. In the spring, you can also set fire to a sulfur bomb. The earth is spilled with boiling water several times. During the growing season, carry out 2-3 preventive sprayings with copper-containing preparations. Destroy weeds around the cucumber plot, as they can also be affected by anthracnose. Ventilate the greenhouse constantly. It is especially necessary to do this in the early morning, when dew appears on the leaves of cucumbers. Anthracnose is easier to prevent than powdery mildew or downy mildew. white rot The causative agent is a pathogenic fungus. Greenhouse cucumbers usually get sick. When growing cucumbers in open ground, it is quite rare. The spread of the disease is facilitated by high humidity of the air and soil and insufficient ventilation of greenhouses. Irrigation with cold water and sharp drops temperature causes disease. The fungus survives on plant debris. Signs of defeat. On the leaves, petioles, lashes and greens, flakes of a white fluffy coating resembling cotton wool appear. Black dots of sporulation later appear on it. The affected areas become soft and slimy. If you do not take action, the plant dies. How the disease is treated Spraying cucumbers with copper preparations: Ordan, HOM, Bordeaux mixture. The whip below the lesion is cut with a pruner and burned. The cut is treated with chalk, coal, ash. All affected greens are removed. At the onset of the disease, the treatment of cucumbers with biological preparations is effective: Gamair, Alirin B, Gliocladin, Planriz. Feed plants with nitrogen fertilizers with the addition of copper sulfate at the tip of a knife. Folk methods of treatment The plaque is manually removed, and the stem is treated with a light pink solution of potassium permanganate. With high humidity in the greenhouse and the threat of disease, cucumbers are sprayed with a solution of milk. 1 liter of milk per 10 liters of water, soap is added to the working solution as an adhesive. Prevention Daily thorough ventilation of the greenhouse. If the nights are warm, then the greenhouse is left open at night. Reducing watering. When a disease occurs, cucumbers are watered rarely, but plentifully. Timely collection and destruction of diseased leaves. Every 2 weeks, 2 lower leaves are removed from cucumbers. This prevents excessive dampness of the soil and prevents the appearance of diseases. Brown (olive) spotting or cladosporiosis Fungal disease. Most often occurs in greenhouses. The main cause of the disease is sprinkling cucumbers with cold water, as well as cold weather (10-13 ° C day and night). The pathogen persists on plant debris and in the soil, it tolerates adverse winter conditions very well. Therefore, when growing cucumbers in greenhouses, when a disease appears, it is necessary to change the soil and disinfect the greenhouse. Signs of the disease. More often it affects young greens, less often leaves. Brown and dark brown sores appear on the greens, releasing drops of a cloudy liquid. Gradually, spots cover the entire fruit, and it becomes inedible. Small dark brown spots appear on the leaves, which gradually merge. How to treat Treatment with copper preparations. Ventilation of the greenhouse. At the very beginning of the development of the disease, treatment with biological preparations Fitosporin, Pseudobacterin, Gamair. Prevention Do not water cucumbers by sprinkling. Watering only with warm water. Timely cleaning of all affected fruits and leaves. It is desirable to produce a crop rotation in the greenhouse. Cultivation of resistant varieties: Amur, Alphabet, Amazonka, Valaamsky, Dobrynya, Green Wave, Pogrebok, Five Stars. Cladosporiosis on cucumbers is very harmful and difficult to treat. If you do not take action, you can be left without a crop. Gray rot The disease is caused by pathogenic fungi that live in the soil and on plant debris. Attacks stems and fruits. The appearance of the disease on ground cucumbers is facilitated by low night temperatures, watering with cold water, poor ventilation and dense plantings. With a strong thickening, the varieties have a huge amount of barren flowers, the pedicels of which are affected first. Description of the disease. On the lashes, especially at the branches, gray slimy spots with a gray smoky coating appear in the axils of the leaves. The spots quickly merge, covering large areas of the stem. On fruits, the disease begins with the spout (where the flower was). A smoky coating quickly covers the entire fruit, it becomes mucilaginous and falls off. Control measures At the initial stage of the disease, the treatment of cucumbers with biopreparations Gamair, Alirin B, Planriz. Treatment with Bayleton. Spraying with Euparen before fruiting. During the fruiting period, the drug can not be used. The solution must not be mixed with Bordeaux mixture and adhesives must not be added. Timely removal of the affected parts of plants. Folk methods of treatment Spraying with a mixture of ash (1 cup), chalk (1 cup), copper sulfate (1 tsp), per 10 liters of water. Water cucumbers with the same solution. Spraying with iodine solution. 10 drops of the drug per 10 liters of water. It is used both for prevention and for the treatment of the initial stage of the disease. Pretty good for all types of rot, treatment with a pink solution of potassium permanganate helps. The treatment is repeated after 4-6 days. Spraying cucumbers with tar infusion. Tar soap(20 g) is dissolved in 10 l of water and processed. All folk remedies are used mainly for prevention. If the first signs of the disease appear, you need to proceed to treatment with biological products. Preventive measures Do not thicken crops. Humidity reduction up to 80%. Regular ventilation of the greenhouse. Timely removal of lower leaves. Collection and destruction of sick Zelentsy. Timely remove empty flowers. Subject to the rules of agricultural technology gray rot usually does not appear in greenhouses. Fusarium The causative agent is pathogenic fungi. Cucumbers get sick mainly in greenhouses. The pathogen persists for a long time in the soil and on plant residues, as well as in seeds. The disease spreads in cold weather with soil temperatures below 18°C ​​and high humidity. Signs of defeat. It affects the roots and basal part of the stem. Penetrates into roots through root hairs and wounds. The first signs are the wilting of individual leaves at the top of the stem, gradually wilting goes down, covers the entire stem and neighboring lashes. Cucumbers look like they haven't been watered for a long time. At the very surface of the soil, a pink coating appears on the stems - sporulation of the fungus. Together with wilting, rotting of the root part of the stem occurs. If you dig up the ground, it turns out that the bark on the roots and the root collar is cracked, and the roots themselves become brown and die. On the transverse section of the root neck, browned vessels are clearly visible. How to treat the disease At the very beginning of the disease, when the leaves droop with a sufficient rate of watering, biological preparations help well. Cucumbers are watered with a solution of one of them: Pseudobacterin, Glyocladin, Trichocin, Planriz, Trichoderma. Simultaneously with watering, spraying of the root part of the stem is carried out. The treatment is repeated after 5 days. Watering plants under the root with Previkur. With the full development of the disease, cucumbers cannot be saved. Sick plants are removed, the ground is sprinkled with bleach. Neighboring cucumbers are treated for preventive purposes. Prevention. When Fusarium appears in the greenhouse, the earth is completely replaced. If this is not possible, then it is sprinkled with bleach, and after 3 weeks they dig a shovel onto the bayonet. It must be remembered that the causative agent of Fusarium is very resistant to adverse conditions and remains viable for up to 7-9 years. Since the spores of the fungus are stored in the seeds, all seeds must be treated before sowing, otherwise cucumbers will have to be treated for this disease again. Cucumber mosaic virus This is how diseased leaves look with cucumber mosaic. The causative agents are a group of viruses that cause various manifestations of the disease. In addition to cucumbers, viruses infect tomatoes, sweet and hot peppers, lettuce, beans, cabbage, currants, raspberries, and about 700 other cultivated and wild plants. The virus persists on plant debris and in the roots of weeds for several decades. Viral diseases mainly affect greenhouse cucumbers. In the open ground, the disease on the culture practically does not occur. The disease is very dangerous, if no action is taken, it can appear on most garden crops, as well as on shrubs. In summer cottages, there are 2 types of pathogens: green mottle virus and mosaic virus. Yield losses are up to 50%. The virus affects crops growing with cucumbers in the same greenhouse (except eggplant). Cucumbers are affected during the entire growing season, starting from seedlings. The virus is spread by seeds. It is also transmitted from diseased plants to healthy ones by contact when caring for cucumbers. Description of the disease. The disease on cucumbers may not appear for a long time. The first signs appear after a sharp increase in temperature above 30 ° C. The veins on the leaves become yellowish. Pale yellow streaks or spots appear along them, which then spread to the entire sheet. Dark green and yellow-silver spots appear. The leaves are deformed and die. The same spots and strokes appear on greens. Some strains of the virus cause fruit deformation. Cucumbers become shortened and bitter, in varieties the seeds do not develop, but remain in their infancy. The source of infection is infected seeds. The virus is actively carried by aphids. In winter, it persists on weeds (wood louse, sow thistle, quinoa), as well as on infected currant and raspberry bushes. Signs of defeat. Most early signs may appear even during the germination period, but usually the first symptoms appear during the growth of the lashes. Diseased leaves show yellow and dark green spots, the sheet becomes tuberculous, corrugated, wrinkled, its edges are bent down. Around the veins, the color may become dark green. Leaf affected by common mosaic. Zelentsy become speckled or striped, with a strong lesion they wrinkle. Dark green areas become convex, and places with normal or light color are depressed. The fruits are especially deformed when the temperature drops to 17-19°C. On the lashes, the internodes are shortened. The growth of lashes is suspended. If the first signs of the disease appear in the second half of summer, then the cucumbers are not damaged so much. Virus Control Measures When the first signs of infection of cucumbers (and other cultivated plants and shrubs) appear, they are treated with Farmayod, which has a strong antiviral action. The drug is sold in garden stores. You can use its analogue Povidone iodine. After treatment, cucumbers should not be watered over the leaves and condensation should not be allowed to form in the greenhouse, since the preparation is easily washed off from the treated surface. In case of severe infection, diseased cucumbers are removed and burned, the rest are treated with Farmayod. Disease prevention Mowing all weeds around the perimeter of the site. It is not recommended to plant other cucurbits nearby, as the virus is transmitted with water, soil and when plants come into contact with each other. Destruction of aphids in the summer cottage. Growing virus-resistant varieties: Alfavit, Mischievous, Nezhinsky, Merry Friends. Complete replacement of land in the greenhouse. Cucumber mosaic virus is very dangerous. If after the first treatment of cucumbers the symptoms of the disease continue to increase, then the plant is removed. Sometimes you have to completely destroy all greenhouse cucumbers, here you have to choose between the preservation of plants and the very high risk of infection of shrubs and trees. You may be interested in:

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Cucumbers: basic information

During the entire period of growing cucumbers, do not overmoisten the site, especially during the cold season. Also, you should constantly monitor the cleanliness of the beds, the temperature environment(if the cucumber is grown in a greenhouse); Treat the plants with a Bordeaux mixture, its 15% solution, as a preventive measure; If the plant is sick, its affected parts should be removed from the garden. If it began to wither, the plant should be completely removed from the territory of the dacha;If you can’t cope with peronosporosis, we advise you to treat the cucumbers with chemistry.

Spraying plants with mullein is also considered effective; In order for cucumbers to suffer less from various kinds of diseases, it is necessary to choose varieties that are resistant to them. India Categories: cucumbers Tomatoes. Soil temperature control (not lower than 20 ° C and not higher than 30 ° C).​ A fertile insect of very small size, which moves quickly through the air, but loves to produce larvae on the underside of cucumber leaves. The larvae are voracious and constantly suck the juice of plants, thereby causing the development of a soot fungus on the deciduous part of the cucumber, and oppressing the plants. It is very difficult to fight the whitefly, especially in greenhouses. To destroy the spider mite on a cucumber in a natural way, you can plant dill nearby, the flowering of which attracts ladybugs - enemies of many plant pests. Be sure to fertilize with potassium sulfate. Sections of plants should be powdered, the soil should be disinfected, watering should be moderate for a while, dusting the soil of the bed (at any planting site) with dry bleach (about 150-200 g per square meter of the bed, and be sure to close it with a rake);

A photo:

So that the disease does not affect plants in the next season, it is necessary to destroy plant debris and carry out a deep digging of the soil of the bed;

Prevention of diseases and pests of cucumber

It is imperative to remove all plant residues from the garden, regardless of which crop they belong to. It will be most correct to burn them outside the territory of the summer cottage. Number of varieties: The fight against diseases and pests of cucumbers The fight against diseases and pests of cucumbers is one of the main concerns of summer residents who practice growing this vegetable on their own plot. Our today's material is devoted to this topic.​

• What is your weather like now?
• Irrigation water should have a temperature equal to the temperature of the plant leaf.
• Breeding the whitefly is difficult due to its high fertility, but the pest control methods for cucumbers themselves are quite simple. They consist in spraying or flushing insect larvae from the leaves of the plant. Next, you should loosen the soil a little in the garden and sprinkle it with humus or peat;
• After the discovery of the disease and the measures taken - cleaning diseased plants from the garden and disinfecting the soil, all boxes, trellises, tool extensions, etc., should be washed with powder).
• This disease spreads rapidly throughout the plant, covering the foliage, stems, tendrils, and even flowering and ovary. All parts of the plant are covered with a kind of mucus and plaque.
• If powdery mildew has only been seen on cucumbers, it is necessary to increase the rate of soil fertilization with potassium;
• Do not forget about weeding plants, because weeds not only interfere with the growth and ripening of cucumbers, but are also carriers of many infections.

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Diseases and pests of cucumber (video)

Cucumber disease control

Powdery mildew of cucumber

Varieties:

If damp, then just sprinkle with ash.

Powdery mildew control on cucumber

In top dressing, use small doses of fertilizers so as not to increase the concentration of the soil solution, which sharply reduces the activity of the leaves.

• The fight against the whitefly is also possible with the help of tobacco, which is planted along the perimeter of the cucumber bed. When the whitefly is collected on the plant, it is treated with Inta-Vir.
• On the one hand, ants are useful for summer cottages, but on the other hand, they dig many underground passages, besiege some plants, and also bring aphids to plants.
• It is not a problem to meet melon aphids on a cucumber. Small insects that destroy everything in their path are located from the bottom of the leaf, attack flowers, ovaries and cucumber fruits. During the period of its active activity and reproduction, the leaves fall from the plant, the flowers wither, the yield is sharply reduced due to the weakening of the mother plant. If wet weather is observed during the period of the aphid attack, the plants often cannot be saved at all.
• White rot feels good on cucumbers in greenhouses, where high humidity, air stagnation, high density of plantings, as well as temperature changes are possible. Remember that pathogens remain in the soil for a long time where the diseased plant grew.
• If the disease continues to spread and endanger the entire garden, you can use poisonous chemicals - Topaz or Oksih, strictly according to the manufacturer's instructions.
• You should be very careful with planting and care, observe crop rotation.

All questions about cucumbers

Downy mildew of cucumber (Cucumber Downy Mildew)

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If dry, then you can make foliar top dressing (spray the leaves) with a solution of mullein or green fertilizer + chicken droppings.

Downy mildew control on cucumbers

Hilling the stems of cucumber plants, which will prevent the accumulation of water at the base of the stem and will not lead to an increase in humidity in the root zone.

• You can fight ants with the help of special traps - bottles with sweet syrup;
• It is required to remove plant debris from the site in time, try to destroy weeds;
• Cucumber disease is manifested by large rounded spots of yellow-brown color on the cotyledons and deciduous parts of the plant, but, due to high humidity, the plant is also covered with a pink bloom. The plaque spreads throughout the plant, concentrates in some places, forms small sores and kills the plant. The disease quickly affects cucumbers, the bushes of which darken and the fruits shrivel. The strength of the disease grows with increased humidity, dew and rain, anthracnose quickly spreads to the root system and destroys the plant. After that, the infection can be transmitted with plant debris and seeds.​
• First of all, they level the agricultural technology of the cucumber to the proper level, also balance the humidity and temperature, make plantings more rare and without weeds in the garden;

It is imperative to destroy diseased plants to the maximum in the garden, near it, as well as to catch and destroy pests that only appear in the planting area.

white rot cucumber

All articles about cucumbers

​Typical problems:​

Controlling white rot of cucumber

• In both cases, remove wilted leaves.
• Against blackleg and Fusarium wilt, positive results are obtained by increasing the resistance of plants through good feeding. The best is top dressing from a weak solution of mullein, slurry, chicken manure, ash liquor. The latter is prepared as follows: two glasses of ash are steamed in

It is required to loosen the soil more often in the beds of cucumbers;

Root rot of cucumbers

Also, it is necessary to observe the change of plants, dig up the soil in the fall, disinfect the soil;

It is required to sow only healthy seeds and only in well-prepared, warmed soil;

Controlling cucumber root rot

• The diseased parts of the plant are carefully cut off and burned outside the dacha, while the wounds after the cut are powdered with lime or ash;
• This disease easily destroys entire fields of cucumbers if you do not pay attention in time and help the crop. Peronosporosis appears as yellow-green spots with a light green bloom, which immediately attack the upper parts of the cucumber leaf. Spots can be of various shapes, they quickly spread to all plants, forming a purple bloom on the lower part of the leaves. Most often, the disease manifests itself in mid-July (in greenhouses and in June), and quickly affects not only the plant itself, but also all neighboring plantations.
• It is also important to properly fertilize the soil, the rates and frequency of application, as well as soil disinfection if cucumbers are grown in a greenhouse.
• ​Ask a question for free​
• Ovary, Diseases, Pests, Bugs, Spider mite
• You can, of course, Bordeaux, but it's a pity to throw away cucumbers. What if the weather will finish them off and you won’t be able to save them?

1 liter of boiling water, stir, infuse for 6 hours, filter, add water so that the volume of the solution reaches 10 liters.

anthracnose cucumber

- a complex process, but if you take it seriously, and even carry out preventive measures, it can be greatly simplified. We recommend reading the article on the best methods of dealing with slugs.​

Fighting cucumber anthracnose

• If you notice ant nests, they are dug up and filled with kerosene;
• If aphids have already appeared on plants, spray with fermented grass (1 kg of grass to insist all day in a bucket of water), or spray with an ash solution (200 g of ash and 50 g of planed soap per 10 liters of water);
• Every year, cultivate the soil with high quality, destroy plant residues and weeds, properly change plants;

A complete disinfection of the greenhouse or soil near the garden is carried out, and plants are also fed (for a bucket of water 2 g of copper sulfate and 10 g of urea, spraying consumption - 1 liter per 10 m2.

Cucumber cladosporiosis (Olive spot of cucumber)

​Cucumber downy mildew is spread by condensation, high ambient humidity, night and day temperature changes, cold watering, morning cold dew and fog. It spreads very quickly, as it is even carried by the wind.

Remember, it is much easier to carry out timely prevention and thereby preserve the crop than to constantly treat plants and waste time trying to get rid of cucumber pests in vain.

Fighting cucumber olive blotch

• More than 70% of summer residents who are engaged in vegetable gardens on the territory of land plots grow cucumbers and other popular crops. Site selection, seed preparation, soil fertilization and long-term care are just a small list of the concerns that a plant has to get high results at the end of the season. But all of them can be crossed out at one moment, and long-awaited cucumbers will not appear on the cucumber bushes in the garden, on the net in the open field or on the trellis in the greenhouse, or their quality will be very spoiled. Perhaps this is the case if the crop is attacked by pests, or if the cucumbers are infected with some diseases. Naturally, it is very reluctant to lose the crop, especially at the moment when the cucumbers began to bloom and showed the ovary. And, therefore, you should take extreme measures and fight for your rights to tasty and fragrant cucumber fruits, which are needed for fresh salads or canning.
• Care features:
• Pour with potassium permanganate.
• already wrote folk remedy- water with serum (1 packet per bucket of water), spray it with the same, but undiluted. Water with Trichopolum - 5 tablets per bucket.

There are more than 14 diseases of cucumber plants that always lead to a decrease in yield. Most often this viral diseases- mosaic (ordinary, white and green). The carriers of infections are numerous species of aphids, and the reservoirs of viruses are numerous weeds, as well as cultivated plants- thistle field, dahlias, gladioli, cannes, phloxes, zinnias. By “visiting” these plants and feeding on their sap, aphids carry viruses to cucumber plants. The virus is transmitted from plant to plant and in the process of caring for planting cucumbers. With this disease, there is a variegated (mosaic) coloring of the leaves, a slowdown in the growth of the lashes and their wilting, and the fall of the ovaries.

Cucumber Pest Control

melon aphid

Ants can be removed by dusting the soil with slaked lime or ash, as well as by pouring boiling water over their nests.

Fight against melon aphids

• Solid colonies of melon aphids are removed from cucumbers by Inta-Vir, according to the instructions.
• ​If you find a disease, we advise you to immediately treat the plants with a Bordeaux mixture (4-5 days before harvesting with a frequency of a week), or with a suspension of bleach (35-40 g per bucket of water, 20 days before harvesting with a frequency of 10 days).​
• Experts recommend fighting peronosporosis in the following ways:

It is believed that powdery mildew is the most common disease, and not only cucumbers, but also many other crops. The disease affects the deciduous part of the plant, a little less often its signs can be found on the stems and petioles, even less often on the fruits of the cucumber. Powdery mildew of cucumber appears on the upper part of the leaf, a small white spot, which gradually covers the entire leaf, and then the whole plant. Over time, the disease negatively affects the plant, and whole lashes fall from its common bush, which are already painted brown. The plant gradually dies, and if it continues to grow in a diseased state, then the quality of its fruits decreases markedly, and the number of cucumbers decreases.

spider mite

Even at that moment, as you just thought about planting cucumbers in the country this season, you must at the same time provide for

Fighting spider mites

• ​Care, Secrets, Tying, Planting, Greenhouse, Growing, Lighting, Temperature​
• the most the best medicine for cucumbers from all diseases, this is the so-called mullein. what it is? this is cow shit, which is poured and insisted on water. water the land where cucumbers grow with this water. Trust me, they love it. verified.​
• it's too late to heal
• As measures to reduce this disease, we can recommend: removing cucumber crops from ornamental and fruit plants, weed control, destruction of aphids with various infusions of plants (garlic, onion, tomato leaves, celandine, etc.) Very often, cucumber plants are affected by fusarium, which manifests itself as root rot or fusarium wilt. Root rot, which affects the roots of plants, is more often observed in an area where a lot of organic fertilizers have been applied, especially if these are plant residues and garbage compost. Before flowering, the affected plants do not differ from healthy ones, but with the entry into the fruiting phase, mass wilting of the lashes begins. With Fusarium wilt, cucumbers become ill starting from the seedling phase, since in this case the vessels of plants are affected by the fungus. The first sign of the disease is the drooping of the tops of the lashes. Sometimes the affected whips restore turgor overnight, but soon die anyway. Fusarium pathogens are soil fungi, the main sources of infection are soil, plant residues, irrigation water and seeds. Root rot most often develops in high humidity and low temperature soil - not higher than + 16-18 ° C.

Ants

Ants fight

• Root rot can affect seedlings and even adult plants, regardless of the planting site. At the cucumber bush, part of the root dies, the entire root system and the neck of the plant begin to get sick, the stem becomes thin and the plant slowly dies. If we talk about the course of the disease, then root rot "burns" the root, and the stem becomes rotten.
• Seed treatment before planting, heating and disinfection with a solution of potassium permanganate;
• This disease is promoted by high humidity and constant temperature changes, planting density, weeds inside the beds. Powdery mildew of cucumber also develops well when watering the plant with cold water, due to winds and drafts, and also if summer residents choose the same place for annual planting. The disease remains in the soil, on weeds, plantain, as well as on diseased plants left in the winter in the garden.
• Preventive measures that will not only help save cucumbers from pests and diseases, but can also prevent them

Plant genus:

Slugs

It's most likely downy mildew... once I managed to stop this disease by treating the leaves with a Bordeaux mixture ... for a week it will not be possible to eat such cucumbers, they will simply have to be thrown away, but then healthy ones will begin to grow ... prepare the mixture strictly according to the instructions ... carry out processing without fanaticism, so as not to burn the plants

Slug fight

• Leaves curl up - this is not a BORA grip. For 10 liters of water-10-20 gr. boric acid
• As measures to combat fusarium diseases, the following measures should be taken:
• The main activity of slugs occurs at night, when they, not being afraid of daylight, devour cucumber greens and spoil the fruits, eating away the pulp. Also, slugs spoil the quality of the crop with traces of mucus and dark droppings.

The spider mite lives on the underside of the cucumber leaf and feeds on its greens. A small red-green sucking insect is very dangerous for cucumbers, especially in greenhouses. Damaging the plant and braiding the leaves with a small cobweb, the tick destroys entire beds, especially in hot weather when the number of individuals increases significantly.

whitefly

This disease affects the fruits of the cucumber, and only in rare cases, the stem and leafy part. The fruits are covered with small but numerous watery spots that grow and become hard. At this moment, the skin of the cucumber cracks, the fruit becomes crooked, the leaves are deformed, the cucumber ovaries die.

Fight against whiteflies

• Cucumber root rot spreads due to improper sowing (poor quality seeds, cold soil), due to cold watering, heavy soil, high humidity, temperature fluctuations. The infection can remain in the soil of the garden for a long time and on the remains of diseased cucumber bushes.
• Planting takes place only in warm and healthy soil, waterlogging is not allowed. Watering young plants only with heated water, mandatory top dressing at all stages of cucumber cultivation;

There are many ways to deal with this disease:

. A small list of requirements, which you will not spend much time on, will save not only the plants and the quantity of the crop, but also its quality, especially if you are dealing with varietal crops. So, what should be the correct prevention of diseases and pests of cucumbers? Cucumber

DachaDecor.ru

Tell me, please, how to treat cucumbers if the leaves are completely wrapped?

Ledovskikh

Manganese water will help - the simplest and most affordable.
Seedlings of cucumbers - so that there are no problems I plant them together with corn, it creates a shadow, cucumbers weave along it and cucumbers do not get sick
Disinfection of soil at all stages of growing cucumbers - soil mixtures for seedlings, freezing the soil mixture for adding plants, as well as the main area where cucumbers will be grown.
You can fight slugs in cucumbers by pollinating the soil with ash, slaked lime, constantly digging up the soil;
The first thing to remember is proper soil moisture and, if waterlogged soil is favorable for many diseases or pests, then for a spider mite, the element is overdried soil under cucumbers;
Olive blotch spreads through the air, can infect cucumber plantings during rain or when watering.
Watering only with warm water, not under the root of the plant;
If the disease is already present in the garden, the plants are treated with a milk solution (1: 9 with the addition of 10 drops of iodine for every 10 l), also with a solution of urea (no more than 1 g per 1 liter of water);
It is necessary to plant only strong and resistant varieties of cucumber and its hybrids;
Planting in the ground requires only high-quality seeds that have been prepared and disinfected.
​Type:​

My neighbor watered milk whey, it costs a penny. But now they stopped selling it because of the cheapness. this folk remedy does not help my cucumbers.

antibiotics