Protecting cucumber seedlings from diseases and pests

 Protecting cucumber seedlings from diseases and pests

Cucumbers, like all plants of the pumpkin family, are very demanding on growing conditions. A slight weakening of attention leads to illness and, possibly, death. But difficulties exist in order to overcome them. It is quite possible to grow full-fledged cucumber seedlings.

The most suitable conditions for cucumber seedlings

Conditions with an optimally balanced combination of light, temperature, humidity and nutrition are ideal for the growth of cucumber seedlings.

Video: growing cucumber seedlings

To get a decent harvest, it is necessary to provide the seedlings with the following conditions:

  • the duration of daylight hours - at least 10 hours, daylight and lighting with lamps (do not illuminate at night);
  • daytime temperature in the range of 22-240 C, night - 15-170 FROM;
  • abundant watering - once a week with settled water with a temperature of 24-260 FROM;
  • carrying out two dressings - 2 weeks after germination (1 teaspoon of urea per 3 liters of water) and a week after the first (1 teaspoon of nitrophoska per 3 liters of water).

Provided all conditions are provided, cucumber seedlings will be vigorous and viable.

Causes of death of cucumber seedlings

During the growth process, seedlings can be affected by a large number of various diseases and pests. Troubles can await young cucumbers both when grown on a windowsill and in a greenhouse. The following misfortunes are most common.

Table: diseases and pests of seedlings

Root rotMelon aphid
Gray rotSpider mite
White rotGall nematode
BlacklegGreenhouse whitefly
Powdery mildewSlugs
Downy mildewWireworm
CladosporiumCucumber gnat

Diagnosis of seedling diseases

Noticing a deterioration in the condition of the seedlings, the first step is to determine what exactly it was caused by and only after that proceed to eliminate the causes. Having carefully studied the symptoms, decide on further actions: change the growing conditions, treat the disease or start pest control.

Table: how to determine the cause of poor seedling condition

Symptoms of the diseasePossible causes of the disease
Care errorsDiseasePest
Sticky spots appear on the leaves, on which sooty mushrooms grow, the greens turn black and dryGreenhouse whitefly
Shoots, flowers, ovaries and leaves wrinkle and curlMelon aphid
Gradually increasing green oily spots appear on the leaves. They turn brown and dry quickly.Downy mildew
A spreading white coating appears on the leaves. The leaves dry up and the plant diesPowdery mildew
The color of the leaves and trunk changesLack or excess of minerals
The leaves have become tough, the top is witheredFertilizer surplus
In sunny weather, the leaves wither, the root part of the stem turns yellow, has cracksRoot rot
Decaying gray spots appear on the stems at the branchesGray rot
Dry the edges of the leavesHigh or low air temperature
Plants wither, translucent larvae are found on the rootsCucumber gnat
There are gnawed leaves, streaks of dried mucus are visible on the soilSlugs
The main stem distorts and dries up unnaturallyWireworm
Small spots appear on the leaves, the lower surface is covered with a thin web.Spider mite
The edges of the leaves turn yellowInsufficient lighting, excessive watering
Plants lie on the ground, the stalk is bitten near the rootMedvedka
Cucumber ovaries turn yellow or rotBacteriosis
Yellow spots appear on the leaves and stems, which become further grayAscochitosis
A white bloom forms on the plant, in places where it occurs, tissues rotWhite rot
Seedlings do not growLate transplant outdoors
An olive bloom appears on the plant, these places dry out and breakCladosporium
The stem at the root becomes thinner and decays, the plant diesBlackleg
Angular yellow spots appear, then they turn brown and dryThrips
The appearance of bulges and thickenings on the roots, the plant does not developGall nematode

Do not confuse the cause of the disease with the disease itself. For example: the cause of the appearance of a black leg may be increased soil moisture, but the plant dies not from moisture, but from a disease.

Fighting cucumber diseases

Timely detection of the disease is 50% of the success in their treatment, but it takes some more effort to fix it.

Table: treatment and prevention

Downy mildewStop watering and feeding, spray with Oxykh (according to the instructions), ventilate the room or greenhouse You can spray with a solution of three liters of serum, one teaspoon of copper sulfate diluted in seven liters of waterObserve the crop rotation. Water only warm (+ 22-240 C), prevent sudden temperature changes, exclude the appearance of condensation on film shelters
Powdery mildewSpray with Topaz or Zaslon (according to the instructions). Or pollinate with finely ground gray, cover with foil for 2 hoursObserve the crop rotation. Water with heated water, do not allow the temperature to drop
Root rotRemove the soil from the trunk and add wood ash, chalk or crushed coal to the affected areas.Do not huddle seedlings, do not deepen the stem when transplanting, do not allow sudden changes in temperature
Gray rotSpray with Topaz or Zaslon (according to the instructions). Or mix 1 cup of wood ash, mix with 1 teaspoon of copper sulfate and dust with the mixture of the plant.Avoid thickening of plants, water with heated water, ventilate the premises
White rotRemove the infected parts of the plant, cover the cuts with crushed charcoal.Avoid thickening of plants, provide ventilation, do not allow an increase in air humidity.
BacteriosisTreat with 1% Bordeaux liquid (100 g per 10 liters of water)Avoid increasing air and soil moisture.
AscochitosisSpray with Saprol or Vincit (according to the instructions).Do not allow an increase in air humidity, do not allow plants to thicken
CladosporiumSpray with Fundazol (30 grams per 10 liters of water).Do not allow an increase in air humidity, do not allow a drop in temperature
BlacklegDrizzle with 1% Bordeaux liquid (100 g per 10 liters of water), pour wood ash under the plantsAvoid thickening of plants, do not allow an increase in soil moisture

Photo gallery: diseases of cucumber seedlings

Pests of cucumber seedlings

In addition to diseases, various harmful insects can damage the seedlings of cucumbers. They appear both when grown in a greenhouse and indoors.

Table: methods of dealing with harmful insects

PestControl methodsPrevention
Greenhouse whiteflySpray with Aktelik or Rovikurt (according to the instructions)Prefers high temperature and humidity. Hang up yellow and blue glue traps for prevention
Melon aphidBefore planting the plants, treat the soil with Karbofos (60 grams per 10 liters of water), if found, process the seedlings (40 grams per 10 liters of water)Avoid the appearance of weeds, remove ant nests outside the greenhouse
Cucumber gnatSpray with Aktara or BI-58 (according to the instructions)Conduct thermal disinfection of the soil, hang up yellow glue traps
WirewormPour the soil with a solution of potassium permanganate (5 grams per 10 liters of water)Carry out podzimny digging of the earth and harvesting plant residues in the greenhouse
Spider miteSpray with Aktelik or Aktofit (according to the instructions)Disinfect the greenhouse with bleach or sulfur bombs before planting.
Gall nematodeWater the soil with a solution of potassium permanganate (5 grams per 10 liters of water), but it will be more effective to replace the soil in the greenhouseCarry out a podzimny digging of the earth, in the spring before planting - thermal disinfection of the soil
SlugsDusting plants with tobacco dust, wood ash, scatter superphosphate or potassium salt over the garden (300 g per 10 m2)Carry out a winter digging of the earth with the addition of fallen needles
MedvedkaFill minks with pesticides (Rembek, Medvedoks)Set traps - a can of liquid is injected flush with the ground
ThripsTreatment with preparations based on thiamethoxam (Aktara, Kruiser, etc.)Carry out a winter digging of the earth, disinfect the earth with a solution of potassium permanganate (5 grams per 10 liters of water)

Photo gallery: pests of cucumber seedlings

Seedling resuscitation

If you figured out the reasons for the death or simply the depressed state of the seedlings, you need to immediately carry out medical measures, and then help the plants to recover. For this it is necessary to create the most favorable conditions. Observe strict temperature and humidity control. In addition, additional fertilizing with mineral solutions should be carried out.

It will take some time to recover, there is no need to wait for quick results, but if you do everything patiently and consistently, the result of the efforts should be positive.

Planting healthy seedlings in open ground

Ideally, pumpkin crops are grown in a seedless way, but in regions where climatic conditions do not allow this, you have to resort to growing seedlings. Despite the difficulties, this method allows you to get a harvest of cucumbers even in the Russian North.

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When yellow, white areas appear on the leaves of cucumbers, or they simply begin to wither and dry, this may be due to:

  1. Not enough light. In poor lighting, the cotyledon leaves turn yellow first (the first two leaves that appear in the seedlings).
  2. Wrong pot size. With the growth of the bush, the root system also develops. And if the container in which it is planted is small, then it becomes cramped, there are not enough microelements and the plant withers.
  3. Little or a lot of moisture. If the plant receives insufficient moisture, then the roots rise from the ground and then dry out. With a large amount of moisture, the root system rots, which leads to yellowing of the leaves of the seedlings, then to the death of the vegetable crop.
  4. Fungal diseases. When growing cucumbers in a greenhouse, irrigation and non-compliance with the temperature regime may occur. As a result, a fungal disease occurs.

  1. Lack of nutrients. It manifests itself in the form of yellowing of the edges of the leaves, which turns into complete drying out of the bush.
  2. Sunburn. When watering, it is important to ensure that there is no condensation on the bush. To do this, it is gently watered at the root.
  3. Damage to the root system. This can occur after planting early or damage to roots when loosening or removing weeds.
  4. Low temperature.
  5. Damage by pests.

It is important to find out the reason why the leaves of cucumber seedlings turn yellow before it leads to the death of the root system and immediately start solving the problem.

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Rare watering

If you water the cucumbers rarely or often, but with a very small amount of water, then the cause of dryness and yellowness of the leaves becomes dehydration. This plant is very fond of water and therefore try to ensure proper watering. However, it is not worth pouring cucumbers - they can start to rot. If the weather is hot, then watering is necessary every day. It is better to do this in the evening, at 18-19 hours, then the water will not evaporate and the roots will have enough moisture for growth. With a moderate temperature regime, watering can be done every other day.

What causes cucumber leaves to turn yellow and curl?

Curling cucumber leaves in combination with their yellowing can indicate serious problems.

1. Lack of batteries. If you notice that the leaves of the cucumbers have begun to fade and curl downward, perhaps the reason lies in a nitrogen deficiency. Examine the leaves, if they are stretched along, and the leaf plate has not grown, the problem will most likely go away after complex feeding.

2. Powdery mildew. In the middle of summer, vegetable crops are damaged by powdery mildew. As a result of this disease, cucumbers turn yellow and leaves curl. For the prevention and control of the scourge, the plants are sprayed with a 1% solution of Bordeaux liquid, and the greenhouse or greenhouse is regularly ventilated.

3. Pests. If the leaves began to curl and turn pale, acquiring a yellowish tint, it is possible that the plant was "attacked" by pests. Examine the back of the sheet. Perhaps it is dotted with aphids or spider mites. In this case, the cucumbers should be sprayed with insecticides or acaricides, respectively.

4. Viruses. If you follow all the recommended living conditions, have carried out top dressing and preventive treatments for diseases and pests, but the cucumber leaves still turn yellow and deform, most likely this is a symptom of a viral disease. Unfortunately, in this case, all that remains is to destroy the affected plant until the virus has spread throughout your garden.

5. Hypothermia or burns. Failure to comply with the optimal temperature regime often leads to yellowing of cucumber leaves. If the leaves of young plants are planted touching hot or cold glass (windows, greenhouse walls) in the sun, this can also lead to twisting. Therefore, it is advisable to plant the plants so that they do not come into contact with the glass.

6. Low air humidity. With a lack of moisture, the plant tries to reduce the evaporation area and rolls the leaves into tubes. The problem will be solved with sufficient watering and humidification of dry air in the shelter.

Cladosporium - brown olive spot

The fruits and stems of the plant are covered with small rounded ulcers of green-brown or olive color, which literally darken on the third day and significantly increase in size? Are rounded or angular specks appeared on the leaves of cucumbers, which are destroyed when they dry? This is cladosporium disease, or, as this fungal disease is also called, brown olive spot.

Cladosporium is a brown olive spot. Photo from the site kartinohigh.ru

Cladosporia develops rapidly in cool, rainy weather and with sudden changes in temperature. In hot summers, brown olive spotting appears already at the end of the growing season - when the nights become cool, a large amount of dew falls. The infection spreads with rain, wind, water during irrigation and remains for a long time not only on plant residues, but also in the soil.

Cladosporium. Photo from the site zelenj.ru

Possible causes of occurrence

The source of infection is plant debris, or rather the spores of the fungus-causative agent of the disease wintering on them.

How to warn


Why do cucumbers have light green leaves?

As mentioned above, the pale foliage of cucumbers indicates a lack of nutrients. And this can happen only in two cases - when the soil is depleted and when the roots or stems of the crop are damaged, because of which the plants cannot absorb fertilizers. In most cases, the blanching of cucumber leaves occurs as a result of a culture disease with Fusarium. The first signs of the disease are decay of the root collar of seedlings and their roots, thinning and drilling of the stem at the base, and the acquisition of a lighter color by the lower leaves. In the absence of treatments, the plants begin to wither, bloom poorly and eventually die.At the first signs of the disease, the culture must be treated with biological products, for example, "Trichodermin", "Baktofit", "Trichophyte", "Planriz" or any other similar means. From folk remedies, a serum-based solution has proven itself well (3 liters of raw materials per 10 liters of water).

If the signs of fungal diseases are not visible on the plants, then most likely the reason is banal - the culture does not have enough nutrition due to the impoverishment of the soil. Only top dressing will help here. It should be noted that cucumbers are a "greedy" crop for nitrogen fertilizers, and in most cases the lack of this particular element leads to foliage fading. Foliar top dressing with urea (15-20 grams per bucket of water) helps to saturate the seedlings most quickly with this element, and from folk recipes - pollination of the soil with wood ash (liter per square meter of the garden). It must also be remembered that at low temperatures, the metabolic processes of the culture slow down, the seedlings begin to starve, therefore, at the first signs of lightening of the foliage, it is necessary to adjust the temperature regime for the plants, if necessary, cover the seedlings or build a greenhouse for them.

How to properly water cucumber seedlings

Cucumbers are very picky about watering. Untimely watering can lead to wilting and drying of the lashes. Therefore, it is so important to properly water the seedlings. Watering should be moderate, it is not necessary to allow the soil to become waterlogged, otherwise the seedlings will wither. The water should be warm (about 24 degrees), it is better to collect it in advance so that it settles.

It is better to water the newly appeared seedlings with a spoon so that the earth does not erode and does not expose the roots. For young sprouts, it is useful to use melted or filtered water. Normal water can contain harmful impurities.

If the cucumbers rose together, and after a week they began to dry out and turn yellow, in most cases this is due to a lack of moisture. Especially the problem arises for those who, instead of watering, spray or water often, but in small portions.

To determine how often to water the beds, you need to take into account the composition of the soil, the temperature and humidity in the room, the amount of sunlight. The soil should not dry out completely. You can deepen a wooden stick along the edge of the container. The soil should be moist and loose to the touch. Seedlings will need to be watered about twice a week. Seedlings, which are supplemented, are recommended to be watered more often.

The basic rule of how to water cucumber seedlings is not only warm water. It is important not to let it get on the leaves. Watering is carried out in the morning, no later than 11 o'clock.

There are rules for how to water cucumbers in a greenhouse or greenhouse. Water during irrigation should not be poured at the root. It is best to leave the soil around the root dry. Greenhouse seedlings are watered between rows.

Watch the video: 7 Simple Tips To Protecting Seedlings from Pests, Disease, and Sun or Wind Damage