How to identify cucumber diseases in the greenhouse and fight viruses and pests


Growing cucumbers in the greenhouse is a little easier than in the open field, but difficulties still arise. To get healthy, beautiful vegetables, it is important to protect them from diseases, pests, and timely start treatment. Learn more about what problems you may encounter when growing cucumbers in a greenhouse and how to eliminate them.

What is sick cucumbers in the greenhouse

Warm, moist environment is ideal not only for heat-loving vegetables, but also their pests. The spread of disease contributes to the violation of temperature, high humidity, poor lighting, lack of nutrients in the soil. Recognize the problem will help photos and descriptions of experienced gardeners. The most common diseases are:

  • different types of rot,
  • fungal diseases
  • bacteriosis.

Pests of cucumbers in the greenhouse

Most gardeners are found with the following pests:

  1. The hothouse whitefly is a small but voracious insect capable of sucking sap from the leaves in a short time. As a result of its vital activity, a black fungus is formed, the plants die.
  2. Aphid is a sucking pest appearing on cucumbers in July-August. It develops quickly, depletes plants, sucking juices and spreading viral diseases. Aphid colonies can be found on the bottom of the leaves.

How to deal with diseases of cucumbers in the greenhouse

Vegetables are affected by fungal diseases, which reproduce well in conditions of high humidity and temperature differences. Their symptoms are similar, so it is not always possible to visually determine the type of the disease. In industry, laboratory tests are done and appropriate preparations are prescribed; at home, the tactics should be different. One should not miss the moment - at the first signs (with fungal diseases there are spots on the leaves of cucumbers) to use harmless home remedies, fungicides, insecticides.

Rot on cucumbers in the greenhouse

If we talk about the disease of cucumbers in the greenhouse and their treatment, it is impossible to ignore the problem of rot. You should fight depending on its type. Overview of types of diseases and treatment methods:

  1. White rot. It progresses in a humid environment, is recognized by a whitish bloom on the whole plant and fruit. The source of the disease is a fungus, due to which the leaves soften and rot. Having found the disease, you should quickly remove the infected parts of the plant, capturing healthy stems. It is desirable to process cuts with charcoal (crushed), lime. So that the infection is not preserved in the soil, it is necessary to disinfect the soil before the next planting of cucumbers.
  2. Gray rot. Can be recognized by a large, brown tint on the leaves, smoky gray, brown bloom on the fruit. The main causes of bacterial disease - waterlogging, low temperature. The treatment consists in the treatment of cucumbers with preparations against gray rot (Bayleton), fungicides. It is useful to sprinkle the affected areas with ashes.
  3. Root rot. Signs: brown deposit on the lower part of the stem, yellowing, cracking. Also, the presence of the disease can be guessed if there is a withering of cucumber leaves in the greenhouse before and after fruiting. For treatment, you can prepare the following remedy: mix honey (3 tbsp.) In half a liter of water, or as much of copper oxychloride, wood ash, and mix. Next, you need to bare the plant to the roots, treat them with a tool with a brush to a height of 12 cm.
  4. Ascohitoz (black stem rot). The main signs of the disease are round spots. At first they are green, then brown, white. Cucumbers with ascohitosis rot, change color. It is necessary to process the Bordeaux mixture, coat the diseased areas with copper-chalk powder. Of the chemical preparations shown are Saprol, Vincite.

Bacteriosis of cucumbers

A disease in which angular spots, small brown-colored ulcers appear on the leaves of cucumbers. Without treatment, holes can form, sores on the fruits, as if birds had pecked them. In dry weather, the signs of bacteriosis become less noticeable, bacteria penetrate into the seeds and become sources of infection later. To exclude bacteriosis of vegetable crops, it is necessary to process the seeds before planting, for example, Bordeaux liquid. Infected cucumber plants are treated with insecticides and fungicides: Bayleton, Aktellik and others.

Fungal diseases of cucumbers in the greenhouse

This type includes:

  1. Mealy dew. Manifested when plants are grown for several years in the same area. A characteristic feature is white bloom on the upper part of the leaves. After infection, the infected foliage, the stems gradually begin to die off, the amount of harvest decreases. A mullein solution helps to cope with a dangerous disease, treatment with a weak solution of potassium permanganate (1.5 g of the substance is used per 10 liters of water). Good results are shown by the use of Topsin, Topaz, the drug Hom.
  2. Downy mildew (perinospora). First, the plants appear a mass of light yellow spots, which with great speed increase in size. It looks as if there are burns on the leaves, the leaves turn brown and dry. When these symptoms occur, stop feeding, stop spraying Topaz plants after 7 days, and treat with pesticide Oxy.
  3. Anthracnose cucumber. It is possible to guess about the infection of cucumbers, if brown, yellow spots began to appear on the leaves and stems. The plant tissue may burst, after which slit-like holes are formed. Without treatment, the fungus spreads to the fruit, and dents are formed on them. To combat anthracnose, spraying with colloidal sulfur is used, treatment with Bordeaux mixture. Effectively treatment with drugs Ciram, Zineb.

Treatment of cucumbers from diseases of folk remedies

Before treating cucumbers for diseases with ready-made preparations, one can use popular methods. Here are some recipes:

  1. Milk solution. Grate 20 g of soap (household), put in 1 liter of milk, mix well. This solution should be sprayed with plants 3 times a month for prophylaxis while they grow. The tool is completely harmless to cucumbers and man.
  2. Some diseases and pests of cucumbers, for example, powdery mildew, can be removed by whey. Heat it to about 25 degrees, spray infected and healthy plants.

Pests in the greenhouse and the fight against them

It is easier to cope with any disease if you define it at an early stage. For example, if cucumber leaves began to turn yellow, do not wait until other signs appear, immediately take action. At first, you can treat folk remedies and conduct additional feeding (if the plant, the seedlings are not infected with fungal disease). In order to prevent, scientists advise gardeners to spray cucumbers with Charm. If it does not help, you should use drugs for pests:

The main causes of disease

  1. Ground contamination: the soil in the greenhouse should be updated every 3 years, removing the top layer of 25-30 cm and replacing it with a mixture of earth, peat, sand. If possible, carry out crop rotation and plant a crop in its place no earlier than in 2-3 years.
  2. Irregular watering: excessive or insufficient, with cold water, in heat and in bright sunshine, directly on the plant, and not under the bush.
  3. Overcooling or excessive heating of the culture: cold nights (below + 15 ° C), hot days (daytime temperatures above + 25-30 ° C).
  4. Incorrect ventilation mode: draft or air stasis in the greenhouse.
  5. Lack of nutrients in the soil: depletion of the soil, inadequate mineral, organic fertilizing.
  6. An excess of nitrogen in the soil under the vine.

Diseases of greenhouse cucumbers and their pathogens

If, with proper care and strict observance of all agrotechnical conditions, cucumbers in the greenhouse start to hurt - the leaves turn yellow and dry, and the fruits are deformed, then they are infected with a disease (fungal, bacterial, viral) or are exposed to pests.

Diseases (fungi, viruses) and pests can cause significant damage to the crop, up to its complete loss.

The main diseases of cucumbers in the greenhouse are:

  • Rot: white, gray, root.
  • Mealy dew.
  • Anthracnose.
  • Perinosporosis (downy mildew).
  • Spotting (cladosporiosis, bacteriosis).
  • Fusarium wilting cucumbers.
  • Viral diseases (green, white mosaic).

Mealy dew and its prevention

Mealy dew is the most common cucumber disease in the greenhouse. Activation of its causative agent - the fungus Erysiphe cichoracearum and Sphaerotheca fuliginea - is facilitated by cooling and heating of air in the greenhouse, humidity fluctuations. The culprits are infected plants (weeds, plant debris), spores of fungus seedlings can become infected through infected soil. Crop loss from powdery mildew in a greenhouse can reach 100%.

The disease manifests itself as whitish-grayish dusting on the outer side of the true leaves of cucumber lashes (spots look like powdered with flour), then a whitish hue appears on the back of the leaf plate. The bush dries out and perishes.

For the prevention of powdery mildew it is recommended:

  • thorough cleaning of soil from plant residues,
  • timely removal of infected leaves and plants,
  • use of pathogen-resistant hybrids.

To combat, they use the method of irrigating the bushes with a solution of urea (1 l) and a liquid mullein (1 l) or a weak solution of potassium permanganate (mix some crystals in 10 l of water until a pink shade is obtained). After removal of infected leaves, the lashes can be treated with a soda-soap solution (4 g of soda ash, 4 g of soap, 1 l of water), irrigated twice, an interval of 7 days.

Perinospora or downy mildew

The causative agent of peronosporoza is the fungus Pseudoperonospora cubensis Rostowz. The main causes of infection is improper watering - cold water, sudden changes in temperature, increased (85% or more) humidity. The seedlings infected with peronosporosis are disproportionately stretched, the ovaries are small, crooked. The leaves of an adult plant from the outside are covered with yellow spots in the form of a polygon, from the inside - a grayish-purple hue, wither and fall.

Plants affected by fungus should be removed from the soil and burned, and the top soil layer (25-30 cm) should be replaced immediately. The spores of the pathogen are well tolerated wintering in the greenhouse, with increasing humidity actively reproduce and affect the healthy lash of cucumbers.

As a preventive measure, you can irrigate the soil in a greenhouse with tansy decoction.

  1. About 30 g of grass (dried or fresh 300 g) pour boiling water (about 10 liters), do not boil, let stand for about a day.
  2. The resulting broth is boiled for about an hour and a half, cool, spray on the greenhouse.
  3. You can sprinkle the earth around the roots of bushes with ashes of fruit trees, in the winter to process the soil Bordeaux liquid.

The treatment of diseased lashes consists in spraying them with combined fungicides, an aqueous solution of freshly-calcined lime and copper sulfate (100 g of each substance per bucket of water).

Anthracnose (Copperhead) and the fight against it

The causative agent of the disease is the fungus Colletotrichum lagenarium, it infects cucumbers at the seedling stage. On greenhouse bushes, the disease manifests itself as yellowish, brown spots of a rounded shape on the outer side of the leaf closer to its edge. The affected tissue of the leaf plate falls out, forming numerous holes.

Sometimes spots can merge, as a result of a lesion the sheet breaks. If the plant is not treated in time, the disease can affect the fruit. Brown spots pressed into the depth of 3-5 mm appear on them, their seeds can not be subsequently used for seedlings.

The plant is infected through soil and organic debris, so it is especially important to remove diseased cucumber lashes in time. As a preventive measure for the disease, it is recommended to replace the top layer of the soil and pickle the seeds before planting into the soil.

To combat coypus, use 1% Bordeaux liquid, which is sprayed with infected leaves. At the root form of the pancake, this solution is poured at the root. Experienced gardeners recommend sprinkling the affected areas with crushed coal and lime.

Rot and their species

Like powdery mildew, rot is a disease of cucumber in the greenhouse, which is caused by fungi. There are types of rot: white, gray, root. The symptom of infection of cucumber root rot is yellowing and wilting of the leaves, while the stem at the root cracks and yellows. When planting seedlings in a greenhouse, it is recommended not to deepen the stem in the ground, not to spud it, do not sprinkle it with soil - this way you can protect the bushes from the disease.

For the treatment of root rot apply a solution of copper sulfate and honey (1 tsp, 3 tbsp., 0.5 l of water). They are smeared with a cucumber stalk to a height of 12 cm. The dead plant from rot must be removed from the greenhouse urgently, and the hole and the soil around it must be watered with a solution of blue vitriol.

Sometimes in thickened plantings on cucumbers you can notice gray slippery spots - gray rot spreads. Poor ventilation of the greenhouse, excessive watering, cold water provokes illness. Having found such spots on one plant, it is necessary to check all the others, process or remove infected ones and adjust the air humidity. Treatment of gray rot consists in sprinkling the affected areas with a mixture of copper sulfate and wood ash (1 tsp. To 1 tbsp.).

Increased humidity can also activate white rot - in this disease the roots, leaves, fruits of vegetables are covered with white bloom, resembling cotton wool in structure. With the development of the disease plaque turns into mucus.

The portions of the cucumber vine should be cut off with white rot, and the slices sprinkled with lime or copper sulfate. The soil after removal of diseased plants should be treated with a weak solution of potassium permanganate.

Spotting and its danger

Cladosporiosis (brown spotting) can destroy the entire crop of cucumbers in a few days. Infected plants and fruits become covered with brown spots from which oozing fluid, they are not suitable for food. The disease develops in greenhouse conditions with excessive moisture.

For treatment, you should inspect all the bushes, remove the diseased, stop watering for 5-6 days, open the doors and windows of the greenhouse and arrange a total airing. It is necessary to establish the optimum temperature for cucumbers: +25? With daytime, +23? With at night. It is recommended to spray the whips with a solution of 1% Bordeaux liquid.

Bacteriosis (angular spotting of leaf plates) is distributed under greenhouse conditions of high temperature and humidity. First, the leaves appear spots that "grow" and are interconnected. Fabrics of a sheet plate die off, disappear and only streaks remain on the sheet. With the spread of the disease the plant dies. With the late treatment of bacteriosis, 50-70% of the crop may die. The degree of disease of other plants in the greenhouse is very high.

Prevention of bacteriosis is the use of quality seed, seed treatment before planting in the ground. After the detection of cucumbers infected with bacteriosis and their removal from the greenhouse, the frame, the frame should be disinfected with lime.

Hazardous Fusarium Wilt

Fusarium wilt is a dangerous plant disease that is caused by a fungus that infects the fibrous bundles of cucumber vines. This stops the flow of nutrients to the tissues of the plant, and it quickly fades and dies at any stage of growth.

Due to the rapid development of this disease, cucumber is not cured, so it is important to promptly warn it not only in greenhouses, but also in open beds. As a preventive measure, you can treat the soil after harvesting with a solution of potassium permanganate.

Viral diseases of cucumbers

Green and white mosaic - viral diseases of cucumbers in the greenhouse. More dangerous is the infection of plants with a green mosaic - it affects the leaves and fruits, which acquire a variegated mosaic color. When white mosaic disease on the fruit formed white and yellow stripes.

Viral diseases are practically not treated. Young shoots are recommended to be transplanted to a new place, old ones are simply removed. Infected fruits should not be eaten or given to pets. From such a harvest will have to get rid of the method of destruction.

Dangerous pests of cucumbers

Growing cucumbers does not require a lot of costs and hassle, the main thing is to protect the plants from pathogens and pests that live in the soil. The main pests of cucumbers in the greenhouse:

  • aphid,
  • Putinite mite,
  • whitefly greenhouse,
  • slugs
  • Medvedka,
  • larvae of beetles.

Aphids on cucumbers: how to distinguish

To understand that cucumbers were “attacked” by aphids is quite simple. The first symptom is wilting of the plant and drying of the leaves. Aphids on cucumbers in the greenhouse multiplies on the back side of the leaf plate: when infected with this pest, the bottom of the leaf is simply littered with larvae and adults. Parasitizing on the cucumber vine, sucking the nutrients, the aphid does not allow the fruit to develop and bear fruit normally, the periods of fruiting are significantly shifted and the crop does not have time to ripen.

The easiest and most environmentally friendly way to get rid of aphids is to irrigate and wash the leaf plates with a solution of soap. Можно оросить плети настоем чеснока, шелухи лука, чистотела.

Spider mite

Shrinking and wilting of cucumbers in a greenhouse can be caused by a spider mite, which envelops the entire shrub with a small web, preventing oxygen and sunlight from penetrating to the tissues of the cucumber vine. Thus, the process of photosynthesis is disturbed, the plant fades. In addition, the spider mite, like other pests of cucumbers in the greenhouse, feeds on sap from the leaves and the stem, stopping the further development of the cucumber lash.

Treatment for spider mites must be immediate, otherwise the entire landing may die. First, you need to remove the leaves infected with mite and irrigate the bush with soapy water. If more than 50% of the green mass is infected, it is recommended to remove the diseased plant from the greenhouse and burn it.

You can use other folk methods: put a jar of chopped garlic or poured turpentine under the bush, wrap the bush with a film and leave it for a couple of hours. The treatment of a plant from a tick should be carried out twice or three times with an interval of 2-3 days: at high air temperatures, the insect reproduces at an accelerated rate, the tick larvae hatch after 3 days and the probability of re-infection is high.

Whitefly greenhouse

The insect infects the leaf plate of the cucumber vine, sucking out nutritious juices. The leaf turns black, withers and dies. Most often the byplate settles on the bottom of the leaf plate. To get rid of it and save the plant, you should wash the leaves with soapy water, then rinse with clean water. Given that the insect does not hibernate in the soil, most often the pest enters the greenhouse along with infected seedlings. Therefore, it is recommended to carefully inspect all plants before planting in the ground.

With minor infections of planting, you can water the bushes with infusion of garlic or dandelion. 100g of garlic should be grated or chopped, pour 0.5 liters of water and leave in a dark place for 5 days. Then dilute 5 ml of garlic extract into 1 l of water and irrigate the infected areas.

Pests of cucumber seedlings

Pests of cucumbers in the greenhouse attack and damage not only the formed cucumber whips and fruits, but also the newly planted seedlings. Medvedka, larvae of click beetles feed on young, immature roots. Seedlings dry out and die.

Among the popular methods of fighting with Medvedka there is this: pour water mixture of black pepper or vinegar solution into the moves.

Slugs eat green mass of shoots, leading to its drying out. As the main method of dealing with slugs, it is advised to leave sliced ​​potato tubers with small grooves for the night in the beds. In the morning they are thrown out of the greenhouse along with the slugs.

For the operative treatment of cucumber diseases in a greenhouse, it is necessary to learn how to identify their pathogens, a photo will help with this.

Experienced gardeners recommend choosing environmentally friendly folk methods of getting rid of pests. If they do not work or the area of ​​infection is large, you should contact industrial plant protection products.

For the prevention of diseases, it is important to organize the correct temperature and ventilation, to maintain the optimum level of humidity, to replace the soil and disinfect it in a timely manner.

Diseases: description and control measures

Occurring diseases in the greenhouse, when growing cucumbers, are not limited to one name. Tell about most common. These include:

  • white and gray rot,
  • root rot,
  • dew: false and mealy,
  • brown spot (olive),
  • leaf mold (black).

Let us consider the disease of cucumbers in the greenhouse and their treatment with illustrative examples in the photo.

Causative agent plant diseases is a fungus. A sign of defeat is a fluffy patina of white in all parts of the plant, from roots and lashes, to leaves and fruits. Secreted by fungus substances not only destroy the plants, but also stored in the ground very long time.

Over time, the diseased plant tissues rot completely. To fight this disease is difficult, but quite possible. The control measures are the removal of all remnants of the affected plant, old fruits and leaves. Full soil replacement is desirable. at the site of planting cucumbers.

Useful information about white rot on cucumbers in the video:

A sign of defeat gray rot is the appearance of gray, slippery spots on the fruit. Then the infection spreads throughout the plant. Fruits, ovaries, flowers are most affected.. Countermeasures are the same with those with white rot.

Only the need for pollination in the initial stages of the disease with a mixture of copper sulfate (one teaspoon) with a glass of wood ash is added. Spraying will help, with strict compliance with the instructions, the drug type "Barrier". The drug is not dangerous for people and animals.

Important: even in the absence of fungal infections, a change of soil in the greenhouse every two years is recommended. Replace the surface layer of soil (about 20 centimeters) with a mixture of earth, peat, sand. Important to ensure good drainage and soil fertility.

Very often, this disease manifests itself when planting seedlings of cucumbers in the greenhouse. Occurs due to deep landing, may occur when conducting additional hilling plant stalks. The disease develops very quickly, especially if the seedlings were planted on the soil where cucumbers used to grow. To provoke a disease can watering with cold water or a sharp decrease in the temperature of the soil.

Disease indicator there are spots on the leaves, which are especially visible after a prolonged bad weather. A sign is also the cracking and well-marked yellow color of the stems. Cracking and discoloration clearly seen, if you otgresti land from the stem in the holes.

Damaged tissue can be clearly seen when raking the ground from the stem of the plant. Places of damage can be powdered with crushed chalk or coal, wood ash. After this is required dry spots. During the next watering, do not allow the stalks to fall asleep with earth, water only the soil in the hole, preventing moisture from entering the affected stalks.

Completely dead stems are cleaned with a clod of earth. Pour the remaining well with an aqueous solution of copper sulphate, prepared in the following proportion: for 5 liters of water, 20 grams of copper sulphate. Dead plant burn.

Useful information about root rot on cucumbers in the video:

Affected Cucumber Stalks covered with white bloom. The lesion is caused by a fungus. The first leaves are affected. Further, the disease spreads to the plant stems. The next stage of the disease is drying and dying off of leaves and stems. An excellent drug to fight is Topaz. The drug is available in ampoules, the contents of which is dissolved in eight liters of water.

The resulting solution is sprayed with affected plants. Treatment with a solution can be carried out not only in the manifestation of signs of the disease, but also for the purpose of prevention.

Spraying solution is prepared at the rate of - three caps of the drug dissolve in a liter of water.

Attention! For the prevention of diseases, especially when large areas of treatment use biologics. Such as Alirin-B, Gamair, Gliokladin, Trihotsin. Remember to strictly follow the instructions for use.

Useful information powdery mildew on cucumbers in the video:

Downy mildew

The causative agent of downy mildew remains in the ground for a long time, can manifest itself in 5-7 years after the first illness. A sign of infection is the appearance of burn-like spots on the leaves. In the future, the leaves become brown. Drying of the affected leaves very fast, no longer than 2-3 days.

To provoke an infection can watering with cold water or a sharp difference in day and night temperatures, high humidity in the greenhouse at night. Struggle measures serves to stop watering and making dressings. Ventilate the greenhouse to reduce humidity.

Useful information of false flour mildew on cucumbers in the video:

Spot spot brown (olive)

Most often defeat manifested on the fruits of plants. Signs are the appearance of defects of brown color, from which is the flow of fluid. If no measures are taken to protect against the causative agent, all plants in a greenhouse may die within a week.

High humidity, drafts, excessive watering, and strong temperature differences during the day can provoke infection. To combat the disease night drafts should be avoided, for 5-7 days, stop watering, in the daytime, the warm time of the day to prevent the appearance of condensation, to air the greenhouse.

Leaf Mold (Black)

Defeat of plants causes funguslocated on the inner surface of the coating and in the soil of the greenhouse. The first most often affected leaves. Further, the disease spreads to all parts of the plant that are above ground level.

On the leaves, spots appear, gradually merging into one. Affected leaves dry out, subsequently covered with black bloomvery similar to the web. The fight measures are disinfection of the greenhouse inside, replacement of soil on cucumber ridges, seed dressing or the use of disease resistant varieties.

Gourd Aphid

Shrinking and twisting the leaves Cucumber most often say about the defeat of melon aphids. On the leaves appear yellow spots, the sheet is folded. When viewed on the bottom of the sheet you will see aphid larvae of various colors. Having chosen the plant, aphid sucking juicesby slowing its growth and development.

The development of numbers is very fast and the aphid spreads over all planted plants. If you find an aphid on cucumbers in a greenhouse, the control measures are the following - in order to protect planting, it is advised to use an infusion of onion peel that will destroy the aphid in your greenhouse.

Why cucumbers dry.

Often our readers complain that the ovaries on cucumbers dry up and fall off. This happens due to the fact that the plants do not stepchildren, and in fact everything that grows from the sinuses of the first 3-5 leaves must be removed, and those stepchildren that are formed above must be pinch above the second sheet.

Another reason that the ovaries turn yellow and dry may be the thickening of the plant - cucumbers do not have enough nutritional area, and they are not able to grow all their ovaries.

However, you should know that cucumbers always form flowers with a reserve in case adverse conditions arise, and when all flowers are pollinated, the plant discards excess ovaries. So the drying of the part of the ovaries is a completely natural process. But what to do if cucumbers dry in catastrophic quantities and you are afraid for the harvest? It is necessary to correct all the mistakes you have made and hope that the plants will recover.

If the already large fruits begin to dry, the reason may be the defeat of the plant disease askohitoz.

Cucumbers are dry because of the fact that you use manure as a fertilizer during the fruiting period, although it is at this stage of development that cucumbers need not nitrogen, but phosphorus-potassium supplements.

The reason that cucumbers turn yellow and dry can be the cultivation of bee-pollinated varieties and hybrids instead of parthenocarpic ones in the greenhouse.

Why cucumbers turn yellow.

Why do cucumbers turn yellow leaves? - this is perhaps one of the most frequently asked questions by site readers. And really, why do yellow cucumbers? And what if cucumbers turn yellow leaves? Let's look at all the causes of this phenomenon.

If the lower leaves of cucumbers turn yellow, this may mean that the plants do not have enough light, but there is nothing wrong with that, so just tear off the yellowed leaves.

It happens that the cucumbers turn yellow in the open ground because of the disturbance of the water balance - either a lack or an excess of moisture in the ground. Do not forget that cucumbers are moisture-loving culture and require watering 2-3 times a week in a normal summer, and in extreme heat the plants need daily hydration. But if it rains for a long time, an excess of moisture can lead to rotting of the roots and, as a result, we will again see yellowed leaves.

However, most often the leaves of cucumbers turn yellow due to fungal diseases - Fusarium, Pythiasis and others. As soon as the thirty-degree heat changes to cold rains and the night temperature drops sharply, be prepared to fight fungi.

Cucumber leaves turn yellow as a result of pest damage such as whiteflies, spider mites or aphids.

And another reason for the yellowing of leaves may be a lack of nutrients in the soil: if the edges of the leaves turn yellow and dry, this means that the plant lacks magnesium or potassium, and dark green veins on the general yellow background of the leaves indicate a deficiency of manganese or iron . With a lack of copper, only the upper leaves turn yellow in the plant.

Well, the last reason for the yellowing of leaves on cucumbers can be a natural process - old age. Over time, the leaves grow coarser, photosynthesis stops in them, they turn yellow and die.

Why leaves of cucumbers dry.

Drying of leaves on cucumbers can occur for the same reasons as their yellowing - this is simply the next stage in the development of the problem. But sometimes the leaves dry out because they were occupied by aphids or mites — turn the sheet and take a close look: if you find insects, treat cucumbers with insect-acaricides Aktar, Aktellik or Basudin.

Leaves are also dry due to peronospora or powdery mildew, as well as from root rot caused by various fungi. See below for how to treat these diseases.

But most often the leaves dry for the most banal reason - due to lack of moisture. Do not allow the soil to dry out either in the greenhouse or in the garden; keep the water balance at the proper level.

Why leaves of cucumbers turn black.

Black plaque on the leaves of cucumbers may appear as a result of the occupation of the plant by aphids: in the course of its life, the aphid leaves the leaves on the fall — excreta, which are a favorable environment for the black fungus that covers the leaves.

A black mesh on the brown leaves is formed as a result of the disease of the plant with black mold. How this disease manifests and develops and how to get rid of it, read in a special section.

Why cucumbers fall.

Therefore, why they dry: due to the fact that you do not stepchild them, because of too many ovaries, because of too thick planting and insufficient area of ​​nutrition, because of improperly conducted dressings and because of some fungal diseases. Read the cucumber care rules and correct your mistakes.

Cucumbers wither leaves.

For all the adverse factors, the plants react primarily with the state of the leaves, and if you notice that your cucumber leaves are withering, look for the cause among those listed below:

  • - insufficient or untimely watering,
  • - insufficient distance between the bushes in the garden,
  • - wrong plot - plants get too much direct sunlight,
  • - mistakes in fertilizing - the soil is oversaturated with fertilizers or they are lacking,
  • - cold snap - cucumbers are very sensitive to temperature changes,
  • - Fusarium wilt, white or root rot, peronosporosis,
  • - aphid or mites, or both.

You only need to identify the cause of leaf wilting and eliminate it.

Cucumber leaves turn white.

This phenomenon can also be several reasons. For example, discoloration of the tips of the leaves (chlorosis) can occur due to a lack of copper, aphids, herbivorous mites or bacteriosis can be found on the leaves. But most often these are signs of diseases such as powdery mildew and white mosaic. How to treat cucumbers for powdery mildew, you will read in the appropriate section, and the white mosaic, unfortunately, is incurable. The carriers of this viral infection are just sucking insects - aphids and mites.

Raid on the leaves of cucumbers.

We have already found out that a black patina can form on the leaves if it is affected by a black fungus or black mold. White bloom is the first sign of powdery mildew. Pinkish-copper plaque - evidence of cucumber damage by anthracnose. White fluffy bloom is a symptom of white rot, and grayish-green (olive) bloom occurs when cucumber disease is caused by cladosporia, or brown spot.

Causes of cucumber diseases in the greenhouse.

Diseases of cucumbers in the greenhouse result from the defeat of the same pathogens as in the open ground - fungi, viruses and bacteria. Only fungal diseases can be treated, and bacterial and viral diseases, unfortunately, are practically incurable. What violations of care conditions cause plant diseases? Why do cucumbers turn yellow in a greenhouse and what to do if cucumbers dry? You will learn about this in the next chapter.

Mealy dew on cucumbers.

Cucumber mealy dew is one of the most common diseases in the greenhouse, which can kill up to half of the crop. The disease begins with the formation of white bloom on the underside of the leaves, and white powdery spots appear on the upper side, which gradually increase and darken. The leaves are deformed, bent and die, the fruits become small and bitter, and as a result the plant fades.

Control measures: As soon as the first symptoms appear, treat cucumbers in a closed greenhouse at an air temperature of 23-28 ºC with fungicides - colloidal sulfur, Byleton, Topaz, Topsin-M in accordance with the instruction, after 10-14 days repeat the treatment. Из народных средств применяют раствор коровяка: в 10 л теплой воды растворяют 1 л жидкого коровяка и 1 столовую ложку мочевины.

Ложная мучнистая роса на огурцах (пероноспороз).

Downy mildew or cucumber peronosporosis is a very dangerous disease, affecting mainly the leaves of plants: brownish-yellow round or angular spots form on their surface, growing and merging with each other, and the underside of leaves is covered with a thick gray-purple bloom. With the development of the disease, the leaves of cucumbers turn yellow and dry, turn brown, frown, break and fall. And in wet weather, the leaves begin to rot. While you are wondering why cucumbers turn yellow in a greenhouse, you can lose the entire crop - peronosporosis develops rapidly.

Control measures: cucumbers are treated with Strobi, Kvadris, Topaz or other fungicides for the destruction of the disease-causing fungus. The treatment is carried out at a temperature of 22-24 ºC, after which the greenhouse should be ventilated, avoiding, however, a strong decrease in the air temperature in the room.

Mosaic on cucumbers.

Under greenhouse conditions, cucumber diseases such as viral mosaics are becoming more common. Viruses penetrate through the soil, damage to plant tissues, with plant debris, from contaminated equipment, are carried by insects. The cucumber mosaic virus can also be on the seeds, but after two or three years of storage of seed, the intensity of the virus is noticeably weakened. Unfortunately, the treatment of plants affected by a mosaic virus with fungicides does not give the necessary results.

White cucumber mosaic - the most harmful form of the virus, capable of reducing the harvest by half. The disease develops at air temperatures above 25 ºC or with sharp fluctuations in temperature. The growth of the lashes slows down; on young leaves, yellow and white star-shaped spots appear, merging with each other. As a result, the leaves turn white, and only the streaks remain green. On diseased plants, few female flowers develop. The fruits form hollows, the cucumbers turn yellow, their flesh hardens.

Green speckled or english mosaic it is shown by light spots along the veins and light wrinkled leaves. With the development of the disease, the growth of cucumbers slows down, the fruits are deformed and also acquire mosaic colors. This type of mosaic is progressing with sharp fluctuations in day and night temperatures.

Control measures: it will not be possible to save the plant affected by any type of mosaic - there are no preparations for this disease yet. It is possible to fight viral diseases by performing agrotechnical culture and taking timely measures to prevent diseases and to care for cucumbers.

Anthracnose cucumber (verdigris).

This fungal disease is caused by the pathogen Colletotrichum lagenarium, which affects not only cucumber leaves, but their stems and fruits. At first, yellow spots appear on the leaves of cucumbers, which later acquire a brown shade, the fabric inside the spots dies, crumbles and spills out, leaving holes. On the fruit ulcers are formed - arranged in groups or single. In wet weather, these ulcers are covered with a pinkish-copper patina. This bloom gradually becomes denser and darkens to literally black. Affected fruits become bitter, and rot or rot during storage or transportation. On the stems and petioles of the leaves also appears a pinkish taint. The disease progresses with high humidity (about 90%) and air temperature within 22-27 ºC.

Control measures: at the first signs of the disease, weekly treatments of cucumbers with one-percent Bordeaux liquid should be carried out. The last spraying carried out no later than two weeks before harvest.

Ways to combat diseases of cucumbers in the greenhouse

As a rule, cucumbers are affected by fungal diseases that multiply well in conditions of high humidity and temperature changes. Diseases are similar to each other, so it is not always possible to determine the type of disease.

In industrial production, laboratory tests are carried out and special preparations are prescribed. At home, you need to apply another practice. It is necessary not to miss the moment and apply at the first signs of the disease harmless home remedies, insecticides and fungicides.

Why there is rot on cucumbers in the greenhouse

When it comes to cucumber diseases in the greenhouse and their treatment, rot is considered the main disease. It must be fought in any case, regardless of its type. Rot spread over several species.

  1. White rot. It progresses in a humid environment, it can be recognized by white bloom on fruits and plants. The source of the disease is considered to be a fungus, due to which the leaves soften and rot. When a disease is detected, you need to quickly remove the infected leaves of the plant. Healthy leaves should be left. Sections must be processed with charcoal or lime. To prevent infection in the soil, before the next planting of cucumbers you need to disinfect the land.
  2. Gray rot. It is recognized by large, brown spots on the leaves. Fruits become smoky gray. The main causes of the disease is waterlogging or low temperature. Treat the fruit is necessary drugs against gray rot. For example, Betoin or fungicides. The affected areas must be covered with ashes.
  3. Root rot. The main features include brown plaque on the lower part of the stem, cracks appear on the plant, the leaves become yellow. The presence of the disease is indicated by the sluggish leaves of cucumbers in the greenhouse before and after fruiting. To treat a plant, it is necessary to prepare the following composition: mix 3 tablespoons of honey in 500 grams of water. Honey can be replaced by copper oxychloride or wood ash. Then the composition needs to be mixed. Plants need to bare to the roots, make treatment with a tool with a brush at a height of 13 cm.
  4. Black stem rot. In another it is called askohitoz. The main signs of the disease are round spots. At first they are green, then brown, then turn white. Cucumbers with this disease rot and change their color. For treatment, they should be treated with Bordeaux mixture, smear the sore spots with honey chalk powder. Of the chemicals shown "Vincit".

Causes of disease

Diseases of cucumbers in the greenhouse may appear due to certain predisposing factors or conditions. There are several reasons why bushes start to hurt:

  1. The level of humidity. During the cultivation of crops it is necessary to closely monitor the humidity of the air. If it is too high, ideal conditions will be created for the development of greenhouse cucumber disease. Due to excessively humid air, fruits, stems, and the root system of plants may suffer.
  2. Non-compliance with agrotechnical requirements during cultivation.
  3. Wrong crop rotation. Often inexperienced gardeners have planted cucumbers in the same place for several years. Also, violations of crop rotation include planting bushes in areas where plants previously grew incompatible with cucumbers.
  4. Bad light. Sometimes greenhouses are installed in places with insufficient sunlight. For cultivation is recommended to choose areas that are well lit by the sun.
  5. Lack of beneficial trace elements and complete depletion of soil. To the soil always contained a sufficient amount of nutrients, it is necessary to periodically feed it. This dressing consists of vitamin, mineral and other useful elements that young bushes need.
  6. Wrong watering. Water the bushes need to be very careful that the water does not fall on the sheets.
  7. Late detection of diseased seedlings. It is recommended to inspect the bushes regularly to check if there are any diseases and pests of cucumbers on them. If time does not reveal the disease at the initial stage of development, then it will eventually move to the rest of the bushes.
  8. Improper airing. The greenhouse must be periodically ventilated. However, this should be done carefully so that there is no strong draft.
  9. Contaminated greenhouse. The greenhouse should be periodically cleaned from the fallen leaves of cucumbers, as they develop various diseases.


In order not to waste time on the treatment of cucumber leaf disease in the future, it is necessary to figure out how to protect cucumbers from it. For prevention you need:

  • water the bushes several times a week,
  • keep an eye on the cucumber beds - periodically weed them, remove weeds and loose dry leaves,
  • cover the bushes with foil or cover the greenhouse to raise the temperature in it,
  • grow only those varieties that are resistant to powdery mildew.

Some people do not know how to deal with this disease. Powdery mildew can be cured with folk remedies. To do this, sprinkle the bushes with a solution of mullein. To make a solution of one kilogram of substance 3-5 liters of water are poured in and infused for 5 days. Then the infusion is passed through cheesecloth and again filled with 5 liters of pure water.

If there is no mullein, you can use sour milk. To do this, it is mixed with boiled water in a ratio of one to one. To spray cucumbers with this solution should be no more than once a week.

You can also get rid of the powdery mildew with the help of soda solution. During its preparation, 100 g of the substance is mixed with 100 g of soap and a liter of water. It is necessary to apply the prepared means every week.


Brown spotting is quite common in adult bushes and affects their leaves and fruits.

Cladosporiosis is a fairly dangerous disease that can spread to all bushes in one week. The first signs of the disease begin to appear on the stems and leaves. They are covered with spots of brown color, which eventually pass on the fruit. Grown cucumbers affected by the disease can not be eaten, so they should be immediately collected and discarded.

In order to get acquainted with the signs of the disease in more detail, you can view photos of leaves that are affected by cladosporia.

The disease occurs and is actively developing with serious temperature changes. Also kladosporioz can appear after watering the bushes with ice water. The disease begins to manifest itself at the final stage of the growing season, when the night temperature is much less than the daytime.

Another common cause of brown spot is the remains of vegetables. Over time, they accumulate a huge number of spores of the fungus, which are very dangerous for cucumbers.

Fusarium wilt

Not all cucumber varieties are resistant to fusarium, so many vegetable growers often experience this disease.

The plant can become infected with fusarium at an early stage of its development, but the first signs will begin to appear only during the ripening of fruits or flowering. First, the leaves located in the lower part of the bush will gradually fade. Over time, wilting will spread to the upper leaves, which immediately turn yellow and change their shape.

Fusarium is confused with celiac disease, as these diseases have similar symptoms. In order to distinguish them, it is necessary to cut one bush and carefully examine the vessels of the stem. If cucumbers get sick with fusarium, they will be colored dark brown. With verticellosis, the vessels are much lighter.

To infect cucumbers with Fusarium, a special pathogen is needed. Fungi may be present on the surface of the inventory or located in the ground. They are also often present in the seedling substrate and in the collected seeds. There are several factors that cause fusarial wilt to occur:

  • not enough light in the greenhouse,
  • seedlings are planted too close to each other,
  • the soil contains a large amount of fertilizers containing nitrogen or chlorine,
  • greenhouse installed near industrial production.

Gray rot

The disease is spread by contact and by air during harvesting or while caring for the bushes.

Gray decay is manifested by the spread of brown spots on cucumber leaves. When humidity increases, mold appears on the cucumbers with fluffy gray spores, which are spread to the rest of the bushes by drafts.

The disease appears and begins to actively develop only under certain conditions. The most suitable medium for the appearance of gray rot is low temperature and waterlogging. Therefore, it is recommended to regularly monitor the humidity and temperature in the greenhouse.

Root rot

Cucumber at any stage of its development can become infected with this disease.

First, the disease spreads to the root system of cucumbers. The roots turn brown and begin to dry. If they are not treated in time, they will die off. Then the disease affects the root neck and stem. They also begin to change their color and fade.

Root rot appears with a strong temperature drop. Also, this cucumber disease can appear due to regular watering of bushes with cold water or too deep planting of seedlings in the ground. It is recommended to immediately get rid of the remnants of plants that were infected with root rot, as they also spread the disease.

Rot of cucumbers.

Cucumbers rot from various infections, so the name of the rot is different - white, gray and root.

Root rot spreads in the soil, in which cucumbers have already grown. They provoke the development of the disease by watering plants with cold water and a significant decrease in air temperature in the greenhouse. Sometimes the disease occurs due to too deep penetration of the seedling during planting or due to improper hilling. Readers ask us: why do cucumbers fade away? And the reason is most often in the development of root rot in plants. If you free the soil from the bottom of the stem from the soil, you will find that it has turned yellow and cracked.

Control measures: in 0.5 l of water, dissolve a teaspoon of copper sulfate and three tablespoons of wood ash, mix thoroughly and apply this mixture with a brush on the stem of the plant from the root 12 cm upwards. Water cucumbers in the morning with warm water under the root. Remove dead plants, together with the earthy clod, and pour the soil in which they grow, with a solution of a tablespoon of copper sulfate in 5 liters of water.

Gray rot or botrytis manifested mucous spots of gray in the leaf axils of the branches. The infection develops on the background of a sharp decrease in night temperature, cold watering, too thick planting and poor air exchange. Gray rot stimulates the development of a large number of male flowers that quickly wither. It is advisable to remove this wasteland immediately.

Control measures: Sprinkle the affected areas with a mixture of a glass of wood ash and a teaspoon of copper sulfate, and if there is no result, diseased plants should be removed and burned, and the soil shed as in the case of root rot.

White rot on cucumbers, or sclerotinia more common than root and gray. Leaves and their scapes, stalks and fruits of cucumbers are amazing. The waste products of the fungus kill the cells of the plant - the tissue becomes sclerotic, on the ground parts a fluffy white patter forms, in which sclerotia form with time, black dots. Affected tissue is rotting.

Control measures: at an early stage of the lesion, sore spots are treated with a mixture of a solution of potassium permanganate and chalk, but if the disease has taken effect, the plant is best removed. Of the fungicides from white mold, Rovral SP, Euparin Multi SP and Oxy can help.

Spotting cucumbers.

Spots on the leaves of cucumbers can cause diseases of bacteriosis (angular spotting) and brown (olive) spotting - cladosporia.

Bacteriosis can be found already on seven-beds - small light brown spots or sores appear on them. Then, on the leaves, angular oily or moist, gradually turning brown spots appear limited by veins. With increased humidity from the underside of the leaves under the spots is collected droplets turbid liquid. As the disease develops, the stained tissues dry out and die off, leaving holes in the leaves. Fruits of cucumbers, too, are affected by deep ulcers, as if by pawing birds, from which, too, as from leaves, exudate flows in wet weather, and a dry whitish crust forms on them in dry weather. Bacteriosis develops at a temperature of 19-24 ºC.

Control measures: at the first manifestations of bacteriosis, the leaves of the plant are watered with a solution of Fitosporin-M, and after two weeks the treatment is repeated.

Brown (olive) spotting. Kladosporioz affects with stains both leaves and stalks of a plant, and its fruits: watery specks form on them, rapidly expanding in breadth and depth. The peel of cucumber in these places cracks and releases a drop of gelatinous liquid, which immediately hardens and separates. When the air humidity is high, a greyish-green velvety coating appears on the sites of kladosporosis, the spots coalesce and form ulcers surrounded by the chloro-zone. If the disease struck the plant at an early stage of development, then one can observe how the cucumber ovaries are deformed, stop developing and turn yellow.

Control measures: at the first spotting symptoms, cucumbers should be treated with fungicides - Rovral, Ridomil, Falcon or similar preparations.

The main diseases of greenhouse cucumbers and their treatment

The most common diseases affecting culture in greenhouse conditions are: anthracnose, powdery mildew, downy mildew, gray and white rot, bacteriosis, root rot. Эти и некоторые другие болезни огурцов мы сейчас подробно рассмотрим, а также предоставим фото зараженных листьев в каждом конкретном случае.

Anthracnose- a disease provoked by the fungus Colletotrichum lagenarium. The fungus actively multiplies throughout the vegetative phase. Recognize the disease on yellowish-brown round spots on sheets and cotyledons. Gradually, the affected parts of the leaves become brittle and crumble. On the shoots appear in-depth spots covered with pink-copper mucus. If the disease infects the fruit, then they also form indentations in the form of ulcers. In conditions of high humidity, these formations become covered with pink mold, and then turn black.

The taste of vegetables becomes bitter, and during storage and transportation they rot. Eating such a vegetable is undesirable.

When identifying these signs, the affected fruit is better to immediately remove, and vines to process with 0.4% chlorine dioxide. You can also apply a 1% solution of Bordeaux mixture. The procedure is performed every 10 days.

Perinosporosis (downy mildew)

Downy mildew or perinosporosis- a dangerous ailment caused by the fungus Plasmopara and affecting mainly foliage. Once on the plant, the perinospora mycelium rapidly develops, blocking the supply of nutrients. The mycelium may persist in cucumber seeds for many years. On the surface of the sheet, yellowish-brown spots first form. Over time, these ulcers expand and grow together. On the reverse side of the sheet there is a thick gray-purple bloom. Foliage dries, wrinkles and falls.

To overcome the disease, stop watering, sprinkle the soil with wood ash. Cover the vines well at night and air them during the day. Spray the solution of Fitosporin. Leaves on both sides carefully process Bordeaux mixture or copper-soap emulsion.

As popular methods used kefir with iodine or sour milk.

White rot

White rot or sclerotinia (Botrytis cinerea mycelium is the causative agent) is a common infection that infects most vegetable crops in greenhouse conditions. Substances secreted by the mycelium, destroy plant cells, resulting in young bushes die. The infection completely infects a cucumber plant: cuttings, shoots, leaves and fruits of cucumbers are damaged.

The symptom of sclerotinia is a white and fluffy patina, resembling cotton wool. The plaque softens over time and turns into mucus. The affected tissues turn black and rot.

Control measures are similar to the procedures used to eradicate gray rot. However, in this case, in addition, dusting of the shoots and leaves with copper-chalk powder should be carried out. The event is carried out at the initial stage of development of the fungus.

Bacteriosis or angular spotting - Ailment caused by the harmful fungus Pseudomonas lachrymans. Initially, small light-brown ulcers are found on the cotyledons, and the foliage is covered with angular spots. Spots look soaked with water or oil. Later, infected tissues turn brown, dry out and disappear. The fruits are also possible manifestations of angular spotting: the cucumber looks like it was pecked by birds.

When the first symptoms of bacteriosis appear on the leaves or cotyledons, first of all you need to get rid of infected plants or seedlings. Then immediately treat the bushes Bordeaux mixture or standard fungicides.

Greenhouse pest control

Along with diseases, your greenhouse cucumbers can attack some insect-parasites. Cucumber vines are more often affected by aphids, whitefly and spider mites. In the fight against every pest has its own nuances. Next, we will study this small pests of cucumbers, get acquainted with the symptoms, as well as photos of fruit lesions, and analyze their methods of treatment.

Black mold cucumber.

If cucumber leaf diseases develop only on leaf plates and petioles, then black mold can affect all the ground parts of the plant. At first small round spots appear, but after a short period of time you find brown leaves on the cucumbers, which are covered with black spider web. The development of black mold is provoked by sharp drops between day and night temperatures.

Control measures: The sooner you find a disease and take steps to destroy its pathogens, the more chances you have to save the plants. The causative agents of the disease are destroyed by a two-stage treatment of cucumbers with one-percent Bordeaux liquid with an interval of 7-10 days.

Fusarium cucumber.

This fungal disease is manifested by the withering of individual leaves and the tips of the stems. With the course of the disease, the stem begins to rot in the area of ​​the root and root collar. Activate infectious agents high soil moisture and air.

Control measures: unfortunately, fungicidal drugs are not able to cope with fusarium wilt, and you can fight it only with preventive measures that will help you to prevent cucumbers from becoming infected with fusarium.

Ascohitoz cucumbers.

Ascohitoz affects both adult plants and cucumber seedlings. On the basal part of the stems of seedlings appear moist spots with numerous black dots - pycnidia. Then a constriction is formed at this place. In adult plants, dry areas appear in the place of attachment of the stalks to the stems, almost black from a large number of pycnidia. Around these areas, the stems become dry, whitish, then crack and disintegrate. Yellow-brown spots appear on the leaves, lightening over time, becoming pycnidic and merging with each other. Zelentsy made as boiled, but do not become soft, and begin to dry out. The disease progresses with increased air humidity, affecting primarily weakened specimens.

Control measures: if there are signs of disease, cycle the cucumber with one percent bordeaux liquid with an interval of 7-10 days.

Diseases of cucumbers in open ground

Diseases of cucumbers in open ground have the same signs as diseases of greenhouse plants, so we will not re-describe their symptoms, but will only tell you about how to deal with diseases in open ground conditions. But cucumber diseases that are not found in greenhouse conditions, and we will describe their treatment in more detail.

Downy mildew (peronosporoz) in open ground.

Methods of struggle: The treatment of cucumbers for peronosporosis at its first insignificant manifestations should be carried out with a 1% solution of urea or a milk-iodide solution (1 liter of skimmed milk is poured into 9 liters of water and 10 drops of iodine are added). It copes well with Bordeaux liquid or copper oxychloride solution. In critical cases, the processing of cucumbers with fungicides Ordan or Ridomil.

Anthracnose (verdigris) on cucumbers in open ground.

Methods of struggle: if the symptoms of anthracnose develop, all affected areas should be treated with copper sulfate (0.5%), then sprinkled with powdered charcoal or lime. It is necessary to conduct weekly processing of cucumbers with one-percent Bordeaux liquid. Stop spraying a week before harvest.

Ascohitoz on cucumbers in the open ground.

Methods of dealing with ascohitosis in open ground are the same as with spotting - treatment of cucumber beds with one-percent Bordeaux liquid. Sprays are carried out at intervals of a week, but the last treatment is carried out no later than a week or two before harvesting.

Black mold on open ground cucumbers.

Methods of struggle: Black mold, or burns of cucumber leaves, is treated at the early stage with fungicides - Bordeaux mixture, copper sulphate, copper chlorine and other preparations, but the previously rusted leaves on cucumbers with black mesh mold are cut. With a strong lesion, diseased plants are completely destroyed.

Rhizoctoniosis of cucumbers in the open ground.

This harmful disease affects plants both in the greenhouse and in open areas. As a result of the development of the disease, you can lose all planting material. The main source of infection is soil. All above-ground parts of the plant are affected, except for flowers: spots are formed on the leaves, and small sores on the fruits.

Methods of struggle: To destroy the pathogen, the soil is treated with Trichodermine or Fitosporin-M, and cucumbers are sprayed with copper oxychloride or Ridomil Gold.

How to deal with diseases of cucumber folk methods

Before the treatment of cucumbers with ready-made medicines, you can try the folk methods.

Milk solution. On the grater, rub 25 grams of laundry soap, put it in 1.5 liters of milk and mix well. This solution should be sprayed cucumbers 4 times a month for prevention during flowering.

Means harmless to humans and cucumbers. Pests and cucumber diseases are treated with whey. It needs to be heated to plus 25 degrees Celsius and spray the affected and healthy plants.

Frequent diseases of greenhouse cucumbers

Powdery mildew, anthracnose, white rot, root rot, downy mildew, and bacteriosis are the most common diseases that affect crops in greenhouse conditions. These are the most common cucumber diseases in the greenhouse.

Anthracnose disease refers to fungal diseases. The fungus develops actively during the growing season. It is recognized by yellowish-brown round spots on fruits and leaves. Affected leaves become brittle and crumble. On the shoots appear in-depth spots that are covered with pink or copper mucus.

If there is high humidity in the greenhouse, then these formations covered with pink moldand then turn black. Such vegetables can not be eaten. When these signs are detected, the affected fruits must be removed and the plants must be treated with 0.5% chlorine with copper oxide. And you can also apply a 1% solution Bordeaux mixture. The procedure is performed once per 12 days.

Powdery Mildew Damage

Indoors, this disease is very common. In diseased plants, a decrease in yield is noted. At the initial stage of the disease, white blotch on the leaves is detected. Gradually, the spots increase in size, and the powdery mildew is distributed on the stem and petioles. The final stage of the disease is the death of the leaves.

If signs of disease are detected, the affected areas should be removed. Bushes needed process sulfur-based fungicides. Good helps infusion of mullein. Re-processing is necessary after 3 weeks. As a rule, sources of fungal infections are located near windows, heating pipes and greenhouse doors.

How to deal with pests cucumbers in the greenhouse

In addition to diseases, cucumbers can attack insect parasites. As a rule, aphid, whitefly and spider mite start on cucumbers. In the fight against every pest has its own nuances.

Gourd Aphid. A colony of insects feeds on cucumber juice. As a result, the plants are depleted, viruses appear on them. The body length of the insect is 2 mm. Gourd aphid has a dark green or black color.

  1. In a short period of time, these pests completely fill the bushes and can destroy the entire crop.
  2. In a cucumber, the stems and leaves are wrinkled first, and then the whole plant dies.
  3. Gourd aphid is on the back of the foliage or on the shoots of cucumber.
  4. As a rule, insects attack in August or July.
  5. Aphids on cucumbers fall from the weeds, so you need to get rid of them in a timely manner.

In the fight against insects will help an infusion of red pepper and tobacco dust. To prepare the solution, you must take 40 grams of pepper and 300 grams of tobacco dust. The composition must be poured 12 liters of hot water.

The finished tincture should be kept in a closed container for 24 hours, then the composition should be drained. In the prepared liquid you need to pour 1 tablespoon of liquid soap and 3 tablespoons of wood resin. After 7 days after the initial spraying procedure must be repeated. Handle including the path between the rows.

Greenhouse whitefly. The whitefly refers to harmful insects that often settle on greenhouse plants. The pest has wings of white color, and its body is covered with wax bloom of white color.

In a short period of time insects are able to destroy the entire crop of cucumbers. The whitefly settles on the leaves, sucks the juice out of them, at the same time it is allocated a sugary substance from an insect.

Many clusters form on the bottom of the foliage. Then the shoots turn black and die. To deal with the whitefly need biological product "Aktofit". The procedure must be carried out three or four times during the entire vegetation phase.

In the soil for cucumbers do not make fresh sawdust. They take calcium from the land and deplete it. Only sawdust that has lain for one year should be used. To protect against whitefly, doors and vents should be covered with one layer of gauze. Inside the greenhouse you need to install glue traps.

To do this, pieces of plywood must be painted in white or yellow. Plywood must be lubricated with a solution of rosin, petroleum jelly or castor oil. In the fight with whitefly will help sprinkling leaves with fresh water. When leaves are washed, sawdust, humus or peat should be added to the soil. In the fight against the whitefly, rabbit, horse, sheep, cow or pork humus will help.