In greenhouses, you can create optimal conditions for growing vegetables: the necessary temperature conditions, proper ventilation, the ideal level of humidity, light, soil saturation with microelements. But even in such conditions, the plants are sick. Most often, cucumber diseases in the greenhouse cause infection of lashes and fruits with various diseases and pests, violation of the agrotechnical norms of crop cultivation, the use of small greenhouses for planting plants that require different conditions of care.
The main causes of disease
- 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.
- Irregular watering: excessive or insufficient, with cold water, in heat and in bright sunshine, directly on the plant, and not under the bush.
- Overcooling or excessive heating of the culture: cold nights (below + 15 ° C), hot days (daytime temperatures above + 25-30 ° C).
- Incorrect ventilation mode: draft or air stasis in the greenhouse.
- Lack of nutrients in the soil: depletion of the soil, inadequate mineral, organic fertilizing.
- The excess 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.
- 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.
- 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.
- The resulting broth is boiled for about an hour and a half, cool, spray on the greenhouse.
- 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 becomes 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:
- Putinite mite,
- whitefly greenhouse,
- 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. You can irrigate the flots infusion of garlic, onion peel, celandine.
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.
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.
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.
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:
- 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.
- Non-compliance with agrotechnical requirements during cultivation.
- 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.
- 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.
- 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.
- Wrong watering. Water the bushes need to be very careful that the water does not fall on the sheets.
- 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.
- Improper airing. The greenhouse must be periodically ventilated. However, this should be done carefully so that there is no strong draft.
- 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 it is necessary:
- 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.
Также избавиться от мучнистой росы можно с помощью содового раствора. Во время его приготовления 100 г вещества перемешивается с 100 г хозяйственного мыла и литром воды. Применять приготовленное средство нужно каждую неделю.
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.
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.
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.
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.
What is sick cucumbers in the greenhouse
In order to win in the fight against diseases of cucumbers in the greenhouse, you need to know about their pathogens as much as possible. An experienced gardener can, at a glance, determine what exactly the plants are sick of and quickly select how to treat them. Beginners can not cope with this task without outside help. Since most diseases are caused by a fungus, their symptoms are very similar.
The main enemy of greenhouse cucumbers is rot. It affects not only the fruits and leaves, but also the roots. The causative agents of this disease are mold fungi. The causes of the development of rot are many. In the first place on the plant affect ventilation in the greenhouse, as well as excessive humidity.
Spores of the fungus are not taken out of nowhere, they are entered into the soil along with seeds, diseased seedlings, humus, etc. No one is immune from this, but you can hold a number of activities aimed at disinfecting the soil. The best option is to sow mustard seed as a green manure, as well as disinfecting the soil with the help of specialized preparations.
There are several types of rot:
- White rot - the leaves and stalks of the plants are covered with white bloom and eventually soften. The fruits of decay exude a terrible smell and become like frostbitten.
- Gray rot - light gray spots on the leaves and fruits. Disease foci resemble velvet in texture. This is nothing but the "bloom" of the fungus. His controversy extends to healthy specimens as well.
- Root rot - brown plaque in the root zone of the stem. The leaves begin to turn yellow and dry quickly. The site of the lesion is greatly thinned, and after that it is rotten. The stem can crack badly from the disease.
- Black stem rot or askokhitoz - looks like round spots of brown, and later black. They spread on the inner surface of the leaves, and sometimes affect the stems. The plant from this disease quickly fade and perish.
If the distance between the bushes is too small, the air will circulate poorly and fungal rot may develop. It is for this reason that landing is not recommended.
In addition to rot, spores of fungal mold can cause quite serious diseases. They are able not only to reduce the yield of cucumbers, but also to destroy all plantings.
There are several types of greenhouse cucumber diseases:
- Mealy Rossa - leaves and fruits are covered with dense gray-white plaques. Over time, the affected areas dry out and fall off. Such a disease causes great damage to the economy, leading to the death of the entire crop. The fruits affected by powdery mildew can be eaten, having previously cleared the skin, but they are not suitable for preservation.
- Pecronosporosis or downy mildew - manifests with faded yellow spots that constantly grow in size. The affected leaves will be decimated, and after the pathogen infects the shoots themselves.
- Anthracnose - characterized by the presence of holes in the leaves. The disease affects the plant with foci, and a bulge is formed at this place, and then a slit-like opening. On the fruits themselves appear depressed lethargic areas.
The danger of fungal diseases lies in the fact that their disputes do not go anywhere, but remain in the ground for many years. In the future, they hit the plant that will be planted in a greenhouse. For the same reason, it is not recommended to plant cucumbers on the same bed for several years in a row.
Cucumber should be removed from the root and burn
It is also worth mentioning about another dangerous disease. Bacteriosis is also called angular spotting, caused by the specific marks that form young shoots. Small triangular black dots cover the entire surface of the cucumber.
One of the main consequences of bacteriosis is greenhouse necrosis. A black drained area forms in the core of the fetus. So you can lose from 50 to 80% of the crop.
The disease quickly spreads to healthy specimens. In order for the pathogen to not be able to infect them, the diseased cucumber is removed from the garden along with the root. After the plant is recommended to burn.
In addition to various diseases, plantings can spoil pests. Most often the tops are attacked by aphids, it fades and turns yellow. Zelentsy on such a plant or not tied, or grow crooked and bitter.
Spider mite can also destroy cucumbers. These little creatures breed rather quickly. By the time the thin white web is visible on the plant, the colony of ticks will be enormous.
Hothouse Whitefly got its unusual name for a reason. It feels well in conditions of high humidity, unlike previous pests. In order for a beautiful white butterfly to turn out of a nondescript caterpillar, the insect needs to eat up to 3 kg of green mass. She sucks all the juice from the stems and leaves of the plant, after which it dies.
How to treat cucumbers
Diseases of cucumbers in the greenhouse and their treatment need special attention from the gardener. You can not let them drift, otherwise the chance is great, to lose all the planting and harvest. In addition, pathogens can affect other crops that grow nearby.
To combat the diseases of cucumbers in the greenhouse and their consequences, it is necessary to treat the plants with special preparations. They are sold in any store selling seeds and related products for the garden.
The fight against rot begins with the removal of affected areas of escape. If we are talking about root rot, the cucumber shoots expose from the leaves 10-15 cm from the ground. Then, in 0.5 l of water, dilute 3 tablespoons of copper oxychloride and spray all the bushes with this solution. It is also recommended to sprinkle them with wood ash. When black stem rot plants need to be treated with powder of copper and chalk.
Treatment of fungal diseases and bacteriosis is recommended using fungicides. They are organic and inorganic origin. What kind of drug to process their beds chooses only the gardener himself. The market offers a huge range of products. Some of them poison the soil by accumulating in it. Organic fungicides do not pollute the environment.
For the treatment of plants, you can use infusions
There is also an alternative treatment for greenhouse cucumbers. These secrets came to us from our ancestors, who did not have at their disposal chemical preparations.
Cucumbers from aphids are treated with a solution of whey and laundry soap. To do this, just lather it. After the procedure, wet leaves can be powdered with a mixture of wood ash and chalk. To scare away the greenhouse whitefly, insist onion peel for 24 hours and then spray the plant with this infusion.
Powdery mildew is also commonly treated with whey. In 1 liter of fermented milk product add 1 tablespoon of honey and spray shoots. You can do the same for any fungal disease. Process this solution and downy mildew.
When working with fungicides, you must adhere to strict personal safety rules. They have a toxic effect when accumulated in the body. Poisonous even fumes rising when spraying plantings. Contact with the skin or mucous membranes can cause severe allergic reactions.
For this reason, when working with fungicides you need:
- wear closed clothes
- use a respirator and goggles,
- wash your hands and face with soap after work,
- wash clothes on high heat.
Toxicity of the drug should be kept away from direct sunlight, as well as children. It is not necessary to carry out processing on a hot afternoon or rainy day.
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. These and some other diseases of cucumbers, we now consider in detail, as well as provide a photo of infected leaves in each case.
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 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.
The colony melon aphidfeed on plant sap, depleting them and spreading various viruses. The body length of the harmful insect is 2 mm. Color black or dark green. These small pests can quickly fill the bushes in a short time, and destroy the crop. First, the stems and leaves shrivel, and then die.
You can watch melon aphids on the back of the leaves and on the shoots of cucumber plants in July and August. Sources of aphids on cucumbers in greenhouse conditions are weeds, so you need to get rid of them in a timely manner. An infusion of red pepper and tobacco dust (30 g pepper and 200 g tobacco dust pour 10 liters of hot water) is considered to be quite effective in combating aphids in the greenhouse. Insist preparation about a day, strain, then make 1 tbsp. l liquid households soap and 3 tbsp. l wood resin. A week after the primary spraying procedure must be repeated. Try also to process the path between the rows in the greenhouse. As for chemicals, the use of Strela or Inter-vir is practiced.
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
Когда заходит речь про болезни огурцов в теплице и их лечение, то главным заболеванием считается гниль. С ней нужно бороться в любом случае вне зависимости от её типа. Гниль распределяется на несколько видов.
- Белая гниль. Она прогрессирует во влажной среде, её можно распознать по белому налёту на плодах и растениях. 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.
- 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.
- 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.
- 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".
Bacteriosis of cucumbers
With this disease, angular spots or small brown-colored ulcers appear on the leaves of plants. If time does not produce a treatment, then holes will appear on the plants, and sores on the fruits. If the weather is dry, the signs of the disease can not be noticed.
Bacteria usually invade the seed and are the source of infection. To get rid of this disease, seeds before planting need Bordeaux liquid. If, however, infection of the fruit occurred, then you need to treat cucumbers with insecticides and fungicides. These include Actellic and Bayleton.
Cucumbers in the greenhouse may experience fungal diseases:
- Mealy dew. It manifests itself when plants are grown for several years in the same place. A characteristic sign of the disease is white plaque in the upper part of the leaves. After a lesion, infected foliage and stems begin to die off, this leads to a decrease in yield. Treat plants with a solution of mullein or treat cucumbers with a weak solution of potassium permanganate. To prepare a manganese solution for 15 liters of water, you need to take 1.7 grams of the substance.
- Mealy dew is false. In another way, this disease is called perinospora. At the beginning, many light yellow spots appear on cucumbers, they begin to grow in size with great speed. From the side it looks like the leaves and fruits are covered with burns. During the disease the leaves turn brown and dry. If you have these symptoms, then feeding plants need to stop. After 7 days, the fruit should be sprayed with a solution of "Topaz", and carry out the treatment with the pesticide "Oxy".
- Anthracnose cucumber. It is possible to guess about this disease if yellow or brown spots began to appear on the stems and leaves. The tissue of the plant is torn, resulting in a slit-like opening. If time does not cure the disease, the fungus will spread to the fruit. Depressed spots will be formed on them. To combat the disease, spraying with colloidal sulfur is used, then plants are treated with Bordeaux mixture.
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.
Pests of cucumbers in the greenhouse
It is easier to cope with any disease if you start to fight it at an early stage. If the cucumber leaves began to turn yellow, then no need to wait for other signs of the disease, you need to immediately take action.
At first, it is necessary to treat the plants with folk methods and conduct additional feeding. Experts advise for the prevention spray drug "Charm". If this does not help, then it is necessary to use the following pests: Zineb, Cyran, Oxy.
Greenhouse cucumbers exposed bacterial, fungal and viral infections more than vegetables that grow in the open field. Diseases and pests are due to the following factors:
- artificial microclimate - these include optimal conditions that are necessary for the normal development and growth of plants,
- incorrect temperature conditions - this includes sudden and frequent temperature changes in the greenhouse,
- high humidity - watering cucumbers with cold water or frequent spraying of 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. Insect body length is 2 mm. Gourd aphid has a dark green or black color.
- In a short period of time, these pests completely fill the bushes and can destroy the entire crop.
- In a cucumber, the stems and leaves are wrinkled first, and then the whole plant dies.
- Gourd aphid is on the back of the foliage or on the shoots of cucumber.
- As a rule, insects attack in August or July.
- 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.