Leaves turn yellow at seedlings of cucumbers: what to do, why this happens

Many vegetable growers grow cucumbers on their plots. This culture is rather capricious and because of this, certain problems may appear during cultivation. Often almost all the leaves of cucumber seedlings dry. To deal with this problem, you should find out why cucumber seedlings turn yellow.

Why do cucumber seedlings turn yellow in a greenhouse

Quite often cucumber seedlings turn yellow in a greenhouse due to improper cultivation.

Incorrect lighting

It's no secret that cucumbers love light, and therefore, sometimes cucumber seedlings turn yellow if there is not enough light in the greenhouse.So that the seedlings of cucumbers do not turn yellow, it is necessary to arrange lighting in the greenhouse in advance. At the same time, it should be diffused so that the whole room is well lit.

Burns

Sometimes the edges of the leaves turn yellow in cucumbers due to burns. Very often, burns occur if too much sunlight enters the greenhouse and the seedlings grow on the window. They can also appear if liquid remains on the plant after watering.

Because of the burns, the seedlings turn yellow gradually. First, the leaves in the upper part of the bushes begin to dry out, and then the lower leaves turn yellow. To prevent burns on plants, it is necessary to ensure that there is not much sunlight in the greenhouse.

Wrong watering

It is known that planted cucumber seedlings should be watered regularly. Some vegetable growers water the bushes too rarely or often, and because of this, cucumber seedlings turn yellow and dry.

With insufficient moisture, young seedlings begin to stretch upwards. This leads to the gradual drying of the ovaries and leaves. A large amount of moisture also negatively affects the he alth of cucumbers. Due to frequent watering, the roots begin to rot, and the cucumbers turn yellow.

Damage to the root system

Many inexperienced vegetable growers damage the roots of the plant when transplanting a cotyledon into a greenhouse. Over time, damaged seedlings begin to turn yellow and dry out. First, yellowness appears on the leaves below, and after a while it spreads to the rest of the leaves that are on top.

Why do cucumber seedlings dry up leaves without top dressing

In some cases, after planting, the leaves turn yellow due to insufficient feeding. At the same time, cucumber leaves dry differently. It all depends on which element the plants lack after planting.

Nitrogen deficiency

With a lack of nitrogen, all yellowed leaves become very pale and small. Sometimes their veins acquire a slight reddish tint. Over time, the bushes become too weak and dry out completely.

Nitrogen deficiency is very dangerous for cucumbers, not only during the growth of seedlings, but also at the time of the formation of the first fruits. Weakened bushes have small cucumbers that do not always ripen to the end.

If the leaves turn yellow and dry due to a lack of nitrogen, then you should immediately feed the plants with fertilizers. For this, a special mixture is made, consisting of ash, litter, mullein and urea. During top dressing, do not feed the bushes heavily, as this may cause necrosis on their leaves.

Lack of phosphorus

Sometimes yellowing appears due to the fact that the plant lacks phosphorus. It is this component that is responsible for the proper development of the roots and providing the bushes with energy. If the soil contains too little phosphorus, this will lead to the fact that each tip on the leaves will begin to dry out. Over time, the rest of the leaves, along with the stem, will begin to darken and dry.

It is impossible to restore dried leaves, but you can stop the spread of yellowing. To do this, it is enough to add a little phosphate fertilizer under each bush. If this is not done, then all cucumbers will die.

Potassium deficiency

This component is necessary for proper cell renewal and uniform ripening of cucumbers. If there is not enough potassium in the soil, then because of this, the leaves on the seedlings of cucumbers dry.The fruits will become covered with dark spots, and the leaves on the cucumbers will gradually turn yellow and dry out. The yellowing process is gradual. At first, the color of each leaf becomes dark green. After a few days, yellow spots appear on them, which as a result will lead to drying.

In order for not all the leaves of cucumbers to turn yellow, you must immediately add top dressing to the soil. For this, potassium sulfate or humate is used.

Magnesium deficiency

This substance is responsible for the formation of chlorophyll and therefore the lack of magnesium will negatively affect not only the leaves, but also the fruits. Determining a lack of magnesium is quite simple, because because of this, all the leaves begin to curl and become stained. At first, the lower leaves suffer, but over time, the upper leaves turn yellow, which leads to the gradual drying of the entire bush. If magnesium supplements are not added to the soil in time, then all damaged leaves will begin to dry and fall off.

Why do cucumber leaves turn yellow in the open field

Most often, the leaves of cucumbers on the street begin to dry out and turn yellow due to diseases or pests. There are some of the most common causes of yellowing cucumbers outdoors.

Why cucumber seedlings turn yellow with powdery mildew

One of the main causes of yellowing is powdery mildew. Any summer resident will be able to detect this disease, since a light red bloom immediately begins to appear on the plant. Most often, powdery mildew develops at low temperatures in conditions of high humidity. Also, its appearance is facilitated by watering plants with cold water.

The main preventive measure of this disease is the correct crop rotation. Cucumbers can be planted in their original place only 3-4 years after the previous planting.If they were planted in the previous place before the specified period, then all the bushes should be transplanted. Transplanting must be done very carefully so as not to damage the roots.

Why leaves dry with cucumber mosaic

Mosaic is a common viral disease that can appear a few weeks after planting seedlings in the soil. The disease is accompanied by yellowing of dicot leaves and their gradual drying. The bushes should be treated immediately after the first symptoms appear, as the mosaic spreads to neighboring plants very quickly.

Yellowing due to downy mildew

Most often the disease appears in summer at high temperatures. During peronosporosis, the cotyledon leaves not only brighten, but are also covered with a slight purple bloom.If signs of illness appear, all fertilizing and watering should be stopped immediately. Sprouts should be treated with a copper solution and special fungicides.

What to do if cucumbers turn yellow

Not every gardener knows what to do if cucumber seedlings turn yellow. There are several common remedies that can help deal with this problem.

Falcon

Many use this particular drug if the seedlings of cucumbers have turned yellow. It can be used not only during the treatment of leaves, but also for the prevention of the appearance of various diseases. To spray infected plants with Falcon, you must use a spray gun and nozzles.

Before you start processing plants, you need to create a special working solution. To do this, 10 ml of the product is mixed with 10-15 liters of cold water. Cucumber seedlings should be processed immediately after preparing the mixture.In this case, the procedure should be carried out in the evening, when there is no wind outside.

Topsin

If the leaves of cucumber seedlings turn yellow, then you can use Topsin. With it, you can get rid of most fungal diseases that cucumbers can become infected with. The tool is sold in the form of a powder, and therefore, before using it, you will have to prepare the working solution. To do this, you need to dissolve 500 g of the product in 10 liters of water.

After treating the area with Topsin, the drug penetrates the soil and enters the cucumber bushes through the roots. It immediately blocks all spores of the infection and prevents them from spreading further. It is not recommended to apply Topsin very often, as the plant quickly gets used to it. Processing cucumbers should be no more than three times a month.

Topaz

Quite often Topaz is used to cure cucumber seedlings. It is very effective, especially if the leaves turn yellow around the edges due to powdery mildew. The drug is non-toxic and safe, so it can be safely used to treat cucumber seedlings.

Topaz is sold in different forms, but most often, special liquid solutions are used to process cucumbers. Before use, the drug must be diluted with water. To do this, 20 ml of the product is added to a large 15-liter container. During processing, about one and a half liters of Topaz should be spent on each bush.

The drug works for two weeks. Therefore, it must be reused no earlier than 7-10 days after the previous treatment.

Strobe

Sometimes, when the leaves of cucumber seedlings dry, it is advised to use Strobi fungicide.The drug is produced in the form of granules, which must be diluted with water before use. It is necessary to prepare the working solution several hours before its use. The solution of Strobi granules is most effective only in the first two hours after creation. Therefore, if you process them too late, it will not bring any result.

It is necessary to process cucumber bushes twice at the time of fruit formation. It is during this period that the plant is susceptible to infection with brown spot, powdery mildew and late blight. Plants should be treated no more than once a month. Stop using the drug should be a few weeks before harvest.

Conclusion

Many vegetable growers do not know what to do if the leaves of cucumber seedlings turn yellow. To get rid of yellowing, you need to understand the causes of its occurrence and the methods of dealing with it.