Various diseases of cucumber seedlings and the reasons for their appearance


Cucumbers are grown seedlings on the windowsill, because they do not have time to adapt in the open field and bring a good harvest before the onset of cold weather. At this stage, it is important to track whether seedlings are developing well.

If the seedlings stretched out, then the wrong conditions became the cause: a lack or excess of light. During growth, seedlings should be kept in a cool shade at a maximum temperature of 22 ° C.

There is an easy way to save sprawling seedlings. To do this, you need to fold the stem with an eyelet, press it against the soil and sprinkle it. So growth will slow down, an extensive root system will be formed.

Tip! Seedlings are sometimes drawn out even with proper care. Therefore, gardeners recommend planting seeds in deep cups in order to fill in additional ground if necessary.

Yellowing leaves

The leaves turn yellow for several reasons:

  • improper care
  • pests
  • fungal disease.

The first reason is the most common. In close capacity, an advanced root system will eventually begin to experience nutrient deficiencies. The soil should be enough, so seedlings with yellow leaves are resettled. Transplanting at the stage of two true leaves is a mandatory procedure. Another solution to the problem of yellowness is to apply nitrogen fertilizer to the soil.

Another cause of yellowness is excess sunlight. In this case, the stains on the leaf plates are burns. Do not forget pritenyat capacity with seedlings.

If there is a sharp withering of cucumber seedlings, the most likely cause is a soil fungus. It penetrates the root system, destroying it. First, the plant ceases to grow. Then the upper part fades, and behind it all shoots. You need to dig up the roots and see: if they have brown rings - this is definitely a fungus.

Sharp withering is of two types:

  1. Fusarium. It is characterized by a temperature content above + 25-28 ° C and dry air.
  2. Verticillary occurs due to a temperature of 16-20 ° C.

When transplanted into open ground, cucumbers with diseased roots are removed. The soil is cleaned from the remnants of last year's vegetation and disinfected with a fungicide.


This disease affects not only cucumbers, but also other garden crops. The black leg is a fungus that lives in the soil. Under certain conditions, it begins to actively develop and hit seedlings. At the very ground the stems turn black. The fungus blocks the movement of nutrients through the plant, it gradually fades and leans towards the ground.

Favorable conditions for the development of black legs:

  1. Too close landing, because of what occurs thickening.
  2. Increased soil moisture.
  3. Abrupt change of lighting and air temperature during day and night hours.

Black leg is a serious and incurable disease. It is useless to fight with him, so if the fungus struck a sprout, then it is immediately removed, and the soil is immediately treated with a fungicide.

To eliminate the risk of a similar disease, it is necessary to ignite the soil before planting seeds in it. Processing is carried out in a microwave or in the oven. Spread the soil on a roasting pan and place in an oven heated to 180 degrees for 40 minutes. To steam the soil, moisten it, pour it into a glass dish and send it in the microwave for 10 minutes at maximum power. The tank for planting must also be decontaminated.

Tip! If the fungus settled on the seedlings, it is not enough to get rid of diseased sprouts. It is necessary to disinfect the dishes for planting. Before moving to the garden, pickle (for example, shed with a solution of potassium permanganate) the soil.

Medyanka, or anthracnose - is a fungal disease that affects the leaves, and if you run it, then the fruits of cucumber. Manifested brown spots. After some time, the affected foliage dries and crumbles. If the seedlings are sick with a creeper, then it can not be saved. This disease can only be prevented.

All affected plants are removed. If any part of the seedlings has survived, then it is sprayed with a 1% solution of Bordeaux mixture.

Mealy dew

Powdery mildew is a common cucumber disease. Its pathogen is a fungus, due to which cucumber leaves are covered with a muddy whitish bloom. By appearance, it resembles flour, hence the name of the disease. At the first signs of powdery mildew, treatment should be initiated. The longer the plant is ill, the less chance of recovery. If you do not overcome the fungal disease, the fruits of cucumbers will be underdeveloped, crooked, soft and unpleasant taste.

How powdery mildew is treated:

  1. All affected parts are removed.
  2. The soil is treated with a disinfectant solution. Not only the soil in the tank, where the diseased seedlings grew, is watered, but also all the neighboring plantings. Preparations for processing: "Topsin", "Karatan".

Gray rot

This fungus affects all parts of the cucumber. First, the plants are covered with gray bloom, then it becomes dark and wet. Gray decay occurs due to excessive humidity and cold water irrigation.

Gray mold treatment:

  1. All affected parts are removed.
  2. Sections are processed with lime or copper sulfate solution.

White rot

White bloom on the leaves and stalks of seedlings is also a fungal disease. It is easy to identify it in appearance: the patina resembles cotton wool. If left untreated, it becomes slippery. Causes of white rot: high humidity in the room, rare airing.

To get rid of an unpleasant disease, you need to cut off all the affected parts of the plant. Treat slices with copper sulphate or powder with lime.

Tip! Treatment should begin at the first sign of white rot. If you run it, the plant will have to dig and burn, otherwise the infection will spread to neighboring plants.

Root rot

Both young seedlings and adult plants may suffer from root rot. This disease is dangerous because its symptoms appear much later than infection, when the rot passes from the roots to the stem. If the plant is struck by this infection, then it must be removed, it can no longer be cured.

Only prevention will help to avoid root rot of cucumber seedlings. The first measure is to treat the seeds for planting. They are disinfected so that all root rot spores will die. The soil for planting must also be decontaminated. Triggered root rot can be too frequent watering and sudden changes in temperature.

Cucumber Mosaic

If the bright spots covered the entire sheet plate in the form of a mosaic - then this is a dangerous viral disease. Its causative agent is a virus, and carriers are insect parasites: the whitefly and aphid. Infection destroys chlorophyll, the cells die. The affected leaf eventually twists and disappears, later the whole plant dies. If cucumbers get sick with cucumber mosaic, they need to be dug up and burned so that the virus does not spread.

Cucumber pests

Cucumbers growing on the windowsill may be subject to pest invasion, although this occurs less frequently than with seedlings in open ground. What pests love cucumber seedlings:

  1. Spider mite The parasite settles on the lower surface of the leaf plate, it is easy to detect it on the web. If you do not get rid of the pest, the cucumber leaf will wither and disappear. The mite likes dry air, therefore insufficient humidity provokes its appearance. As a preventive measure, cucumbers are sprayed with water in dry weather. To get rid of spider mites, it is necessary to treat the plant with onion peel extract: 100 g of raw material pour 5 liters of water and insist 5 days.
  2. Aphid. This tiny insect is difficult to notice, as its body takes 2 mm in length. More often aphid is found when it forms a colony. This insect multiplies rapidly, causing the stem and leaves to dry out. A tobacco extract will help against aphids: pour a liter of water with a filling of 20 cigarettes, bring the mixture to a boil and boil for 10 minutes. It is enough to spray the affected plant with this agent once, so that the whole aphid colony will die.
  3. Whitefly. If she settled on cucumber seedlings, then all the leaves will begin to turn yellow, curl and fall off. Against this insect also helps tobacco infusion, but more concentrated.

General rules for the care of cucumber seedlings and disease prevention

Diseases of cucumber seedlings are easy to prevent, observing comfortable conditions. Basic rules for caring for seedlings:

  1. Cucumbers are a heat-loving culture, therefore they are watered only with warm water (25–27 ° C). Watering with cold water is contraindicated.
  2. The soil should not be waterlogged, it leads to the development of fungal diseases.
  3. Seedlings should not be exposed to drafts.
  4. The temperature in the room where cucumbers grow should be constant: allowable fluctuations - from +18 to + 23 ° С during the day.
  5. Humidity, optimal for seedlings, 70-75%.
  6. Top dressing is necessary: ​​the first is made in the phase of two true leaves, the second - three or four leaves. The interval between feedings - 8-10 days.

  1. Seeds are planted for 25-30 days before moving to open ground. If you do this later, then weak and small shoots may not settle down after picking, if earlier - you will get elongated overgrown seedlings from which healthy fruiting bushes will not form.
  2. Seeds before planting must be soaked in a solution of potassium permanganate. This procedure not only disinfects, but also makes the seedlings more enduring.
  3. Soil is better to buy in specialized stores. Well, if it is similar to the one in which cucumbers will grow in the garden or under the film.
  4. Garden soil needs to be disinfected, loosened and saturated with fertilizers, otherwise it will be difficult for the seeds to germinate.
  5. Before planting, a drainage layer of expanded clay is laid in the tank.
  6. It is necessary to sow seeds at a distance so that the sprouts do not touch each other. This will prevent them from being pulled out.
  7. Watering is carried out in the morning. If the plant will “fall asleep” with wet leaves, it will strike a fungus.
  8. Seedlings necessarily protect from direct sunlight.

Diseases of cucumber seedlings are numerous. Fight them start before planting seeds. Seedlings from decontaminated seeds in a healthy soil will disturb the gardener much less often.

Diseases of cucumber seedlings in the greenhouse

Despite the creation of favorable conditions in the greenhouse, various diseases of cucumber seedlings often arise and their treatment becomes a necessity. Seedlings can turn yellow, wither, blacken, grow brown or wet, it is not uncommon and the complete death of seedlings. The leaves of the affected plants form different in shade, size and shape of the spots, which often lead to serious problems with the growth of vegetables.

Ascochitis - a disease in cucumber seedlings

Many gardeners growing cucumber seedlings in a greenhouse face another problem. Often they do not know why the leaves of the cucumber seedlings turn yellow, they wither and soak. This problem is usually caused by a disease called ascochitis. It is caused by improper care of the vegetable crop. The disease leads to the death of the root system and blackening of the root hairs. The leaves dry up, dry, they form large and ugly dark spots. Black dots grow, and in young, newly sprung plants, the seedbed leaves become discolored.

Often, during ascochito, cucumber seedlings turn yellow, which begins at an early stage of the growing season. Initially, green-gray spots are formed on the leaves of seedlings. They are watery, but gradually become brown. When such areas begin to dry out, they become whitish. Traces of damage to vegetable crops grow rapidly, covering the whole stem. At the same time, the tissues crack, and from them a brownish or milky liquid begins to stand out.

The fight against this disease is extremely simple. All infected plants should be removed. Places where they grew, it is recommended to process fungicides or Bordeaux mixture.

Diseases of "home" cucumber seedlings

Not only the greenhouse seedlings of this vegetable can be infected. Diseases of cucumber seedlings on the windowsill are not uncommon, as at home the protection of plants cannot be guaranteed 100%. Usually, non-compliance with the basic rules of agricultural engineering, poor-quality soil or improper watering leads to any disease.

Dying off the roots of cucumber seedlings

Another common disease of the "home" cucumber seedlings is the death of the roots. At the same time it is impossible to isolate clear signs of infection. After all, there are no white spots on the seedlings of cucumbers, the leaves do not turn brown and do not turn yellow. Vegetable culture simply stops growing. She can wither and die for no reason. In such situations, often the cause of the problem is the death of the roots.

What is the cause of this disease of cucumber seedlings, which is cultivated on the windowsill? Usually the problem is caused by improper irrigation when irrigation is done with cold liquid. It may be watering at a normal temperature, but the window sill itself is too cold. In this case, the soil cools very quickly, and the root system of the plant freezes. As a result, it begins to die off gradually. To fix this problem is quite simple. Enough to more carefully and carefully treat seedlings.

Mosaic Virus in Cucumber Seedlings

Many gardeners are interested in why the cucumber seedlings turn yellow, and the leaves of seedlings roll up. Usually the causative agent of the problem is the cucumber mosaic virus. Such a disease affects the seedlings not only at home, but also in greenhouses. The disease manifests itself primarily on the leaves of the plant, they shrivel, wrapped down along the edges. The plates themselves acquire an unusual mosaic pattern. Often gardeners think why cucumber seedlings turn white leaves when infected with such a virus. In full, the plates do not become whitish. Light and dark areas alternate on them.

Among other manifestations of the disease is worth noting:

  • reducing the number of flowers
  • leaf plate area reduction,
  • the formation of stains on the sheets
  • shortening internodes
  • cracking the stem.

Eliminate the effect of wart, which is created when cucumber seedlings are infected with a mosaic virus, is rather difficult, as this disease is triggered by a variety of factors. Among the causes of the appearance of the disease stands out a sharp decrease in temperature. Most often, affected seedlings are not cured. They can only be completely removed. Read the article: Why tomato seedlings stretched in the first days of growth, what to do in this case?

Signs of seedling disease

The most characteristic signs of cucumber seedling disease are the following phenomena:

  • Appearance of yellowness on the streaks of grown real leaves,
  • Thinning and watering of the stem under the cotyledon leaves
  • Leaf curl,
  • Stunting for no apparent reason
  • Drying leaves with the transition of defeat to the stems.

Diseases of cucumber seedlings, leaf photo:

Yellow leaf streaks

The appearance of yellowness on the streaks of the leaves is associated with infection of the plant, virus carrier is the whitefly tobacco. The adult individual of the whitefly after 30-35 minutes of feeding on an infected plant becomes a peddler of the virus.

Without the appearance of external symptoms, varieties are ill, as well as cucumber hybrids pollinated by bees. But Parthenocarpic (self-pollinated) varieties are most severely affected.. Manifested in the form of a sharp decline in yield, shortens the period of active fruiting. Damage to the virus can lead to plant death.

Stalk thinning

On examination, you found the dead seedlings. View the plant in more detail. If you find stalk thinning in the form of stem stumps, this is a fungal infection - cucumber root rotcaused most often by violation of growing conditions most favorable for seedlings. Why does cucumber seedlings fall:

  • Frequent excess feedings mineral fertilizers or mullein,
  • Sharp changes in daily temperature,
  • Abundant watering or watering with cold water.

These reasons cause wateriness and thinning of the stem of the seedling under the cotyledon leaves, followed by lodging of the seedlings. The culprit of the fungus is the causative agent of root rot of cucumbers.

Is cucumber seedlings falling? What to do?

Do not plant in one place every year.. The fungus can be stored in the soil. Change the ground or carry out soil treatment before planting by watering with a pink solution of potassium permanganate heated to a temperature of 65-70 degrees.

The measure of the struggle is reduction in irrigationespecially in the period of sudden changes in daily temperatures. Limit the amount of fertilizer applied. Water the seedlings with warm water in the evening.

Leaf curl

For example, wilt with leaf curling may occur for a fairly simple reason, namely lack of moisture for normal development. When a plant grows, its leaves begin to evaporate more moisture from their surface than they receive it from the roots.

In this case, leaf curling will be an elementary protection. Растение старается уменьшить площадь листьев, с которой происходит испарение. Простое увеличение объема воды для полива избавит ваши сеянцы от этого недуга.

При осмотре обнаруживаете умеренно влажную почву, но при этом скрученные листья растений. So a seedling can respond to soil deficiency of trace elements. First of all, it is phosphorus, sulfur, magnesium. To eliminate the cause, irrigation combined with fertilizing with mineral fertilizer containing a set of micronutrients necessary for the development will be sufficient.

In the case of withering and if the cucumber seedlings are curled leaves after transferring plants to the ridge can be foliar application.

Compositions for such dressings can be purchased at specialized horticultural centers, or you can cook it yourself.

It is enough to dissolve 150 grams of urea in a bucket of water. Spray the leaves of the plant with the prepared solution. This feeding contributes to a more rapid absorption of essential trace elements through the leaves of transplanted seedlings.

Development lag for no apparent reason

These symptoms most often occur. due to the dying off of the seedling root, although signs of damage can be seen at any stage of plant development. The most likely reason for watering with cold water or the rapid cooling of the box with watered seedlings.

Seedlings are lagging behind in growth and development, seedlings are not growing. Further death of the plant is observed.

Why does cucumber seedlings fade?

Many, especially novice gardeners, are wondering why cucumber seedlings turn yellow and dry with full adherence to agricultural cultivation. The most common cause is attack on plant pests.

These include spider mites, as well as melon aphid. Both parasites damage the leaves, sucking the juices necessary for the development of the plant. And this leads to the appearance of yellow spots and drying leaves.

Gourd Aphid

Determine the damage to plants can be visually, according to the changed color and shape of the seedlings leaves. On the leaves there is a noticeable appearancehoneydew"- this is the excretion of pests. This excreta is an excellent breeding ground for fungi.

It is necessary to inspect the seedlings for pest identification. If aphids occur, then help treatment with drugs Decis or Inta-vir in strict compliance with the instructions on the packaging of the insecticide. Read more on fighting aphids.

Preventive measures

In order to prevent damage to seedlings by pests, the following measures should be taken:

  • Free planting seeds, which eliminates the contact of the leaves with each other,
  • Maintaining daily temperature regime - day 22-24, night 16-18 degrees Celsius,
  • Watering at room temperature.

Carefully select cucumber resistant varieties.

Also comply with the norms of agrotechnical and pest damage prevention.

All these measures and proper care will allow you to grow healthy seedlings, which will be the key to your harvest.

If, nevertheless, your plants are sick, then in the article we described how to treat cucumber seedlings for diseases?

Why seedlings get sick

Any seedlings are small, weak plants.. They are not strong enough to successfully resist environmental influences. Unsuitable growing conditions can trigger cucumber seedlings. Growing seedlings on a windowsill is easier than in a greenhouse, but even there it is difficult to avoid the factors that influence the appearance of diseases.

  • Sharp temperature drops.
  • Excessive watering.
  • High humidity.
  • An excess of some trace elements in the soil.
  • Sowing seeds infected with any disease.
  • Insufficient ventilation in the room.

It is these factors that most often become the cause of the emergence of seedling diseases when grown in home and in greenhouse conditions.

Cucumber seedlings affect a variety of diseases. Some of them do not pose a threat to other plants, since they are provoked by a lack or an excess of nutrients and negative environmental effects. Others are dangerous for other plants, as caused by viruses, bacteria and fungi.

The most common are fungal diseases. Their list is very extensive.

Alternaria leaf disease

This disease most often affects seedlings grown in film greenhouses. As a rule, the plants closest to the entrance of the greenhouse are affected first. To learn about the fact that sick cucumber seedlings can be on its appearance. In the central part and along the edges of the lower leaves are found brown spots ranging in size from 1 to 2 cm. These spots are convex and dry.

Excessive moisture provokes this disease at a temperature of 25 ° C.

Immediately it should be said that this disease occurs infrequently. In addition, it does not lead to the death of seedlings, as it rarely affects other leaves and parts of plants. However, if you do not start treatment in time, the affected leaves will simply disappear. This will seriously slow down the development of seedlings and in the future will reduce the yield.

The treatment of leaf alternaria is to treat the leaves with a solution of copper oxychloride and Bordeaux mixture.

This is a serious disease affecting seedlings on the windowsill as well as greenhouses. It can destroy all plants. Anthracnose poses the greatest danger in greenhouses.

This disease is manifested on leaf plates and stems of seedlings in the form of brown or yellow spots. Damaged tissue dries quickly and literally falls out. As a result, the leaves of the plant become leaky, and the stems can break.

If time does not begin to treat this disease, then in the future it can affect the fruit. Sick cucumbers will have expressions up to 4 mm in depth on their surface.

It is worth noting that anthracnose appears only in conditions of high humidity (more than 90%). Therefore, the most effective means of combatingYou can reduce the humidity in the room up to 60%.

The danger of anthracnose pathogen is that it can perfectly tolerate cold on glass, plastic and wood. That is, the fungus can hide anywhere in the greenhouse or on the windowsill.

For the treatment of this disease is usually used 1% solution of the Bordeaux mixture. At each bush should pour at least 200 ml. At the same time you need to make sure that the solution gets on the infected stem. This procedure should be repeated at the first sign of the return of the disease.

Ascochitis or black stem rot

This disease is very rarely seen in seedlings planted in the open field and quite often in plants grown on the windowsill or in greenhouse conditions.

The disease begins with the appearance on the stems of light-green round-shaped spots, which quickly grow in size, merge and subsequently completely capture the entire stem. After this plant tissue begins to get wet. In some places on the stem drops of turbid moisture appear.

Spots may move onto the leaves. Usually they are detected at the very edge. They can occupy half of a sheet plate. As a rule, the appearance of askohitoza on the leaves leads to their death.

The fungus that provokes this disease can parasitize not only on seedlings, but also on adult plants. True, in the latter case, the plant should be significantly weakened.

For the treatment of this disease usually use a mixture of chalk and copper sulfate. This powder should be powdered leaves. You can also treat the seedlings several times with a solution of urea and copper sulphate with an interval of 10 days.


Basically, this disease is sick seedlings grown in film greenhouses, but it is sometimes noted on plants grown on the windowsill.

The fungus that causes the disease can settle on any part of the plant: roots, stems and leaves. It feels best in high humidity and low temperature.

The disease is manifested by the appearance of white spots on the leaves and stems. These are colonies of fungus. Soft, watery and slimy to the touch. Colonies intercept most of the nutrients circulating through the leaves, which leads to the death of the latter. In the absence of treatment the plant dies pretty quickly.

The danger of sclerotinia is that this pathology can be transmitted not only mechanically, but also through the air. In addition, if you do not cut the affected areas of the leaves, then later in their center you can notice the appearance of black formations. They are called sclerotia. Thanks to these bodies, the mycelium can persist in the soil for several years.

The main source of the disease is contaminated land. Therefore, experts recommend that when the appearance of sclerotinia to destroy all the seedlings of cucumbers, along with the soil and planting capacities. However, you can try to cope with the infection in a less radical way:

  • To introduce into the soil a biological product Trikhodermin.
  • Treat damaged leaves with a mixture of chalk and Sumileks.
  • If there are few lesions on the plants, it is necessary to remove the damaged leaves and parts of the stem with a sharp knife. After the procedure, do not forget to process the cut sites with charcoal.
  • Be sure to feed the seedlings.

Viral diseases

The most common viral disease of cucumber seedlings is mosaic. She is green and ordinary. The first affects mainly seedlings on the windowsill and in greenhouses, the second mainly appears on plants planted in open ground.

To determine the disease can be on the appearance of plants:

  • The leaves are covered with dark green spots, arranged in a mosaic pattern.
  • The edges of the leaves are twisted down.
  • Plant growth slows down.

If untreated, the mosaic will also appear on the fruits. Mosaic coloring appears on them. In addition, they become warty. Since there is still no cure for this disease, experts recommend gardeners to pay more attention to prevention. It consists in the following activities.

  • Do not plant seedlings next to indoor flowers.
  • Disinfect instruments used in the treatment of seedlings.
  • Destroy plants that show signs of this disease.

Angular Leaf Spot

This is one of the most dangerous diseases. It completely destroys all the seedlings on the windowsill. The first step is that bacteria infect seedbed leaves. Then, on the lower surface of the large leaf plates, wet spots appear, which gradually turn brown. Later, the central part of these spots is destroyed, which is why the leaf plates become leaky like a sieve.

Such spots may also appear on the stems of the plant. There they gradually increase and become covered with a white crust.

Until now, scientists have not been able to develop an effective tool to combat angular leaf spot. The only way to save seedlings - destruction of diseased plants. You can also try to contain the infection by regularly treating the seedlings with copper-containing solutions.

Bacterial wilt

This pathology is caused by microorganisms that are transferred from plant to plant by insects. For this reason, it most often affects seedlings planted in open ground. Russian gardeners may not yet be afraid of this disease, because there are no insects in our country that are considered to be potential vectors of infection.


To prevent diseases of cucumber seedlings is much easier than coping with them. Therefore, before sowing seeds need to carry out proper work with the soil and seed material. This will avoid most of the dangerous diseases of cucumber seedlings.

The main causes of pathologies

The basis of any disease is non-compliance with the rules of vegetable farming:

  1. Fungi that cause disease cucumber seedlings, hiding in the ground. If you take the land from the garden, then most often it is infected. Purchased substrates are usually disinfected by manufacturers.
  2. Seeds, collected independently, can carry microorganisms that cause disease cucumber seedlings.
  3. For the development of pathogenic fungi favorable conditions such as excessive air dryness, high humidity. And their combination with low temperatures will lead to wilting of shoots.
  4. Nutrient deficiencies occur when cucumber seedlings have grown densely. Hence the disease seedlings. Fertilization should be based on schedule. You can not too saturate the soil with fertilizers, especially nitrogen.
  5. When watering seedlings with cold water, it suffers from this, gets sick.
  6. Disturbance of growing conditions, when there is little light in the seedlings, and the temperature in the room is low or high, leading to illnesses.

If the seedlings are grown in greenhouses, it is necessary to control the illumination, temperature and humidity. Shoots can become infected even when the ground and walls of the room are not disinfected.

Symptoms of fungal infections

Spores of fungi, having lived in the ground or seeds, begin to multiply actively, moving from one plant to the next. They penetrate into all parts of the seedlings, ruining young cucumber bushes. If spots appeared on cucumber seedlings, the fungi began their destructive activity.

To destroy the disease of cucumber seedlings, you need to know the signs of the most common.

Although cucumber seedlings are rarely affected by anthracnose, but if they become ill, then it is difficult to get rid of it. The leaves of seedlings are covered with yellow or brown spots, as if burnt. Having merged into one ulcer, the dead sites fall out, forming sclerotia. If the diseased seedlings are not treated, then after planting them in open ground or a greenhouse, the disease will turn into fruit, depriving the crop of vegetables.

The fight against fungal infection is carried out as follows:

  • removing diseased plants
  • treating the seedlings at the first sign of the disease Bordeaux mixture or copper oxychloride solution,
  • sprinkling with fundazole.

Fungi remain in the ground, therefore, before sowing cucumbers on seedlings, the soil is calcined in the oven.

Downy mildew

Symptoms of perinosporosis include the following:

  • the appearance of light spots near the streak of leaves,
  • the spread of large brownish spots,
  • the presence of white bloom on the underside of the leaves, which eventually becomes purple hue,
  • curling and falling foliage.

The course of the disease is rapid when the air temperature in the room reaches above 28 degrees, and the humidity is 90 percent.

To inhibit the development of the disease will help treatment fungicidal Topaz or Fitosporin.

Fusarium wilt

Fusarium mold fungi will kill young seedlings if measures are not taken in time.

Cucumber seedling during the day looks drooping, recovering at night. The fungus penetrates the contaminated soil, forming a mycelium inside the plants.

To seedlings did not die, they are treated with Previcur. A badly affected seedlings is better to destroy.

Gray and white rot

A slippery patina of gray appears on the stalks when humidity reaches 90 percent. The reasons for the formation of white slimy raids on the leaves, the stems is also the presence of a large amount of moisture in the air and in the soil. If you notice the appearance of fluffy lumps on the seedlings, then, having stopped watering, spraying, bring the seedlings back to normal.

Ways to eliminate disease

Diseased cucumber seedlings can always be saved from disease. The main thing is not to miss the time, but to begin treatment, having discovered the first signs of pathology:

  1. To save a diseased plant can be a transplant. During the procedure, the affected leaves are removed by sprinkling powdered cut with activated charcoal. With the defeat of the roots they are washed, cutting off the black and covered with rot, treated in a weak solution of potassium permanganate. Replant seedlings in separate containers, pre-disinfect the ground.
  2. Of the effective treatment methods, treatment with Fitosporin or Topaz is popular.
  3. Folk remedies can not be discounted, conducting the fight against fungal diseases of cucumbers. You can use whey by dissolving one liter in a bucket of warm water.
  4. You can also treat seedlings with onion peel extract, dissolving fifty grams of it in ten liters of water. The mixture is brought to a boil, and then cooled and filtered.
  5. In the treated foliar fertilization of the seedlings, the appearance of the leaves will be restored, the spots will disappear. For spraying prepare a solution of ten grams of urea, two - copper sulphate and one gram of zinc sulphate per bucket of water.
  6. To improve the soil in it make a biological product Trichodermin.

Spraying cucumbers and their treatment is in line with the signs of infection found in seedlings. The photo and description of its symptoms will help determine the disease.

Overview of the best fungicides

The market offers many chemicals for the treatment of cucumbers from fungal infections. Diseases of cucumber seedlings can be treated with such drugs:

  • Bordeaux mix,
  • By quadris
  • Topaz,
  • Phytosporin.

In the Bordeaux fluid - copper sulphate with lime, mixed with water. Lime mortar is used to neutralize the acidity of the liquid, so as not to burn the leaves of the seedlings. Apply Bordeaux mixture to spray the seedlings of cucumbers in order to prevent fungal diseases.

The components of the Quadris fungicide have a detrimental effect on the spores of the main pathogenic fungi, stopping the flow of air to them. After drug treatment, pathogenic microorganisms die within an hour.

The active substance in the composition of Topaz stops the development of mycelium, and the fungus dies. Средство хорошо впитывается в ткани рассады огурцов и действует мгновенно. Для опрыскивания всходов берут один миллилитр средства на два литра воды. Топаз длительно действует на споры грибков.Preventive treatment they spend once in the period of growth of seedlings, then after planting cucumbers in the ground.

Fitosporin belongs to natural biofungicides, as it contains live spores and cells of bacteria that live in the soil. In contact with water, they begin to multiply, suppressing microorganisms dangerous for seedlings. Dilute the powder with boiled or spring water. After some time, when the bacteria wake up and are activated, they begin to spray the cucumbers. For better adhesion, you can add a little soap to the mixture. If the drug is liquid, then dilute it is not necessary.

Use these tools in the fight against fungal infections - powdery mildew, fusarium wilt, gray, white, root rot, anthracnose. Apply them according to the instructions at least three times. They help seedlings regain health, protect against infection later, after planting seedlings in open or closed ground.

What viruses and bacteria infect seedlings

If fungal infections of seedlings are treatable, then it is more difficult, sometimes impossible, to get rid of viral and bacterial infections.

Virus mosaic is recognized by randomly scattered spots on the sheet plate. The form they resemble mosaic made up of dark and light areas. At the same time, the ends of young leaves of cucumber seedlings twist down, and the next ones do not develop.

Cucumber and mottled green mosaics are distinguished when the surface of the leaves becomes wrinkled, covered with light spots. The disease occurs when the seedlings are planted thickly, and the temperature in the room reaches above 27-30 degrees Celsius.

They carry the aphid mosaic virus, which often settles on cucumber seedlings.

The danger of a viral infection is that it destroys the seedlings. Therefore, it is necessary to destroy diseased plants quickly. And the soil from the containers disposed of or disinfected.

Pathogenic bacteria cause angular leaf spotting. For the active development of microorganisms need low air temperature in the room and high humidity. And the ingress of moisture on the leaflets of seedlings will enhance the effect of bacteria. Fight them hard. Meanwhile, the leaves of the seedlings are covered with angular spots of different shades of brown. With the development of the disease, the plants die.

Getting rid of cucumbers from viral and bacterial diseases is impossible. It remains to say goodbye to sick seedlings to save the rest of the plants.

Biological agents in protecting seedlings from diseases

Help protect seedlings from disease treatment with Trichodermine. The drug is used for disinfection of seeds, and for entering into the soil during sowing. For one pot take twenty milliliters of a biological agent. Spray the seedlings with a solution of the drug when they have two true leaves. Repeat the procedure every ten to twenty days.

The effect of the drug Planriz and Pentafag is high. Processing seedlings means will reduce the risk of infection of cucumbers fungal and bacterial infections.

Attentive attitude to vegetable plants, knowledge of the rules of agrotechnology contributes to the fact that young seedlings of cucumbers will delight with the green of the leaves, with a strong stem. Healthy seedlings will develop into strong plants, giving high-quality cucumbers.

Why cucumbers are sick

It should be noted that at home, the chances of catching some disease or fungal infection, and even more so, a pest, cucumbers are much less than when grown in a greenhouse or in open ground.

Caring for a culture at home is simpler, and less protective measures can be taken. However, no matter how you take care, you still have a chance to pick up the disease: after all, microorganisms are everywhere, carried by people, pets, pests and virus spores can simply fly out the window.

However, the most common cause of cucumber disease is not some external "enemies", but insufficient care. Poor-quality watering (too abundant or, on the contrary, scanty), improper air humidity, improper feeding and other causes usually cause diseases of this culture. So, we will consider further the most frequent direct causes of cucumber diseases on the windowsill.

First, it is watering with cold water. Do not forget about the extreme thermophilicity of this culture, and know that watering cucumbers is always necessary only with heated water.

But how is feeding cucumbers during flowering, and how to do it correctly, is indicated here.

On the video - why cucumbers are sick:

If you used cutting tools that did not undergo preliminary disinfection during trimming of the bushes, infection or fungal spores may well penetrate the plant tissue.

Growing cucumbers in poor barren soil is also often the cause of disease culture.

Video: growing cucumber seedlings

To get a decent harvest, it is necessary to ensure the following conditions for seedlings:

  • daylight duration - at least 10 hours, daylight and lighting with lamps (do not highlight at night),
  • daytime temperature is within 22–24 ° С, night temperature is 15–17 ° С,
  • abundant watering - once a week with separated water with a temperature of 24–26 0 С,
  • holding two supplements - 2 weeks after germination (1 teaspoon of urea for 3 liters of water) and one week after the first (1 teaspoon of nitrophoska for 3 liters of water).

If all the conditions are met, cucumber seedlings will be vigorous and viable.


This disease also has a fungal nature. Fracture is an insidious disease, since it “eats” not only the leaves, but also encroaches on the fruits. A sign of this disease is the appearance of brown spots on the leaves, and then the desiccation and fragility of the affected foliage. Ugly ulcers appear on the fruits due to this disease.

No matter how sad, but the creep does not respond to treatment. The plant affected by this disease will have to be dug up and destroyed. And it is necessary to do this as quickly as possible so that the treacherous fractures do not hit the neighboring bushes. The surviving specimens must be sprayed for preventive purposes with a 1% solution of Bordeaux mixture.

Sclerotinia (white rot)

This fungal disease can also affect cucumbers on the window sill, and it manifests itself as a white coating on the leaves and stems. This characteristic bloom - looks like cotton wool at first, and then transforms into mucus.

To get rid of white rot, it is necessary to sprinkle the affected parts of the plant with lime or copper sulphate. But first it is necessary to remove white growths. Note that this disease can only be managed in its early stages.

When the rot hits most of the bush, it will have to be dug out and burned until the infection has spread further.

Sclerotinia usually causes too high humidity in the room where cucumbers grow. To prevent this disease, it is recommended to arrange airing regularly: this measure is especially important after irrigation.

Spider mite

This pest affects cucumbers most often: it especially likes to settle in heated greenhouses, but is also dangerous for plants in open ground. It can also hit homemade cucumbers. This insect settles on the underside of foliage, weaving its own webs there. It is the presence of cobwebs and tell you that the plant has occupied a tick. The sheet dries out after a short time, and then dies off altogether.

In order for the tick not to hit the cucumbers, it is important to maintain optimum humidity in the room: this indicator should be 80% before the fruit ripens, and 90% after the cucumbers have started to fill. If the weather is too dry and there is no humidifier in the room, simply spray the bushes periodically with water.

On the video - spider mite of cucumbers:

If the spider mite has already appeared, onion will help to cope with it. Infusion is prepared in the following proportions: 200 grams of onion minced through a meat grinder (garlic will do the same) on a bucket of water. And here is how the fight with kidney mite on the currants in the spring, is indicated in this video.

On the surface of the leaves and stems of domestic cucumbers can also settle and aphid - an insect that multiplies very quickly. The difficulty of detecting this pest at the initial stage lies in its miniature size: the body does not exceed 2 mm in length. And aphid is found, as a rule, already when she managed to build a colony of considerable size.

Aphid settles on the plant, gradually leading to desiccation of leaves and stems. To cope with the scourge at home will help the concentrated tobacco broth.

To prepare the tool, you need to stir in a liter of water tobacco from twenty cigarettes (a pack!). After that, the water must be brought to a boil, and boil for 10 minutes.

On the video - how to overcome aphids on cucumbers:

To broth acquired more digestible concentration for cucumbers, it is diluted with another liter of water. Spray the leaves with this solution: usually enough once to kill the entire aphid colony. But why there is aphids on currants and cherries, and what control measures exist, it is indicated here.

White fly

This harmful insect also infects the leaves of cucumbers, leading to their gradual yellowing, twisting and death. They fight whitefly with tobacco broth too, but only more concentrated than when fighting with aphids. In addition, you can try to collect insects with a regular vacuum cleaner.

Equip this useful unit with a small car attachment, and carefully treat the entire leaf surface.


We learn what preventive measures will help cucumbers on the windowsill grow healthy and strong.

Mandatory preventive measure is soaking seeds before planting in potassium permanganate. This measure disinfects planting material, helps cucumbers grow healthy and strong.

Carefully choose the soil for growing domestic cucumbers. Most often, insufficient disinfection of the soil and leads to the fact that it comes across spores of microbes, fungi, larvae of pests.

It is undesirable to dig the ground on the street - it is preferable to buy it in finished form in the store.

During the growing season, spray the bushes with a drug like Fitosporin. This tool helps to germinate most dangerous cucumber diseases and pests.

On the video - the prevention of cucumber disease:

Carefully care for the plants, observing all the recommendations for watering, maintaining the humidity of the air, feeding, lighting. Avoid sudden temperature drops and drafts. Do not forget that watering cucumbers is necessary in the mornings and extremely warm water.

We learned what diseases and pests can affect growing on the windowsill cucumbers. As you can see, even at home, the culture is not protected from diseases: but it is also important that with proper care cucumbers are ill at home much less often. Follow all the simple rules of care, treat the plants on time, as soon as you notice the first signs of the disease - and there is every chance to see a good crop of tasty vegetables.