Why cucumber leaves turn yellow

Correct agricultural technique

Planting has long outgrown capacity

If the disease manifests itself at the initial stage of fruiting, you can forget about the harvest. The disease spreads rapidly, leading to the death of the fetus.

Powdery mildew can appear after watering with cold water. The leaves begin to brighten and wither, spraying with manganese solution and mullein solution will serve as an ambulance.

Melon aphid:

Fusarium

Dark green veins with yellow spots - iron deficiency.

A new gardening season begins, and the question arises of how to avoid last year's problems and provide your family with a good and high-quality harvest. Many gardeners are concerned about the yellowing of cucumbers: seedlings, leaves, whips, embryos, greens turn yellow.
Maybe cucumbers just lack moisture? After all, all cucumbers love water.
Cucumbers are not long-lived plants, but, nevertheless, I would not like to see yellowed leaves on young plants.
Read moreWhy garlic turns yellow in the garden
Return frosts

... In this case, the roots of cucumbers have nowhere to develop, the plant lacks nutrition. The only way out of this situation is to urgently transplant plants into open ground or into a greenhouse.

Experienced gardeners must, before the fruiting period of cucumbers, carry out preventive spraying of the garden culture with special means: twice at a frequency of a week. In addition, for cultivation in a greenhouse, it is better to choose varieties of cucumbers that are resistant to this disease.

If root dust is damaged, the soil must be fertilized with chalk, ash and crushed coal. Plants whose roots are already affected by the disease must be removed along with the affected soil in order to avoid further spreading to healthy roots.

Settles on the underside of leaves, feeds on plant sap both in the seedling phase and in adulthood throughout the season, as a result of which the leaves turn yellow.

Occurs when there are sudden temperature changes with the appearance of ovaries or due to damage to the roots and stems when loosening. The toxins released by the fungus delay the supply of nutrition, the leaves turn yellow and the plant withers. It is necessary to replace the contaminated soil and choose other varieties of cucumbers.

The dying off of the lower leaves and yellowing of their tips are a lack of zinc.

Why do cucumbers turn yellow? Among the possible reasons, several main ones can be distinguished.

Cucumbers need to be watered properly. They need to be filled with water so that the water penetrates into the deep layers of the earth and the roots of the cucumbers absorb moisture.

Leaves may turn yellow due to prolonged rainy weather or excessive water flooding. This usually occurs during the seedling stage.

The yellowing of leaves in greenhouse plants can be the result of the phenomena that we have already mentioned in the article. This can also include return frosts, when plants need to provide additional shelter, as well as damage to plantings by fungal diseases. But greenhouse plants also have reasons:

- this is one of the main reasons for the yellowing of the leaves of cucumber plantings in open ground. To prevent this from happening, it is necessary to plant seedlings in a timely manner. It is worth remembering that the culture develops safely at a temperature of + 22 + 26 degrees. If it gets colder outside, then cucumber plantings will need to provide additional shelter. This can be done using film or special materials - spandbond, agrotex or lutrasil.

Diseases of cucumbers

2. Very often yellowing of cucumber seedlings

Cucumber insects - pests

Associated with pests

If we talk about insects that cause yellowing of leaves in cucumbers, then the most common of them are melon aphids and spider mites.

One of the most dangerous enemies of the cucumber is the greenhouse whitefly, capable of feeding on the juice of leaves and stems. Frequent weeding will partially eliminate this problem, due to which the cucumbers also turn yellow in the greenhouse, because it is from the weeds that the whitefly moves to the fruiting plant. When ventilating the greenhouse, close the opening with an air-permeable mesh as much as possible. Spray with water as often as possible and do not forget to loosen the soil, apply fertilizers in the form of rotted sawdust, peat and humus. The planting of cucumbers in the greenhouse begins in early May. The soil is prepared for this in the fall by treating it with a solution of potassium permanganate and water (3 g per bucket). But very often when growing, gardeners find that the ovaries and leaves of cucumbers begin to turn yellow.
- the most common disease of cucumbers in greenhouses and greenhouses with high humidity. Small light spots appear on the leaves, then covering the entire surface, with a reddish or whitish bloom. Then the leaves turn yellow, dry, the ovaries shrink and die off. Infection of cucumbers - from July to September, especially in rainy weather. If you do not take action, the fungus may appear next year. The problem of yellowing and subsequent dropping of flowers and ovaries of cucumbers due to insufficient soil fertility can be solved during the growing season with regular fertilizing of mineral and organic fertilizers. The content of essential microelements in the soil is also of great importance. Improper feeding can also cause cucumbers to turn yellow.

Love warm and humid environments

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Make sure that water droplets do not fall on the leaves, otherwise the leaves may burn.

So that such a problem does not arise, it is recommended to plant cucumbers in a garden bed well filled with manure. Also, once a month, you can feed the cucumbers with purchased mineral fertilizers. Once a week, you need to add a weak solution with fertilizer under the bushes.

With a lack of minerals in the soil

Diseases typical for this culture

... If these are found on the seedlings, it is necessary to urgently take action and treat the seedlings with appropriate preparations.

The cause of aphids on the plant is the same as in the previous case - the presence of weeds. In addition to carefully weeding and loosening the soil of the greenhouse, it is regularly necessary to spray the lashes with soapy water and tobacco infusion.

Why cucumbers turn yellow in a greenhouse is explained by five factors of disturbance during care:

Bacteriosis

Watering

... For their proper development and fruiting, temperatures from +22 to + 25 ° C are needed. At temperatures below + 14 ° C and above + 42 ° C, plants stop developing, turn yellow and wither. Therefore, in our conditions, with short-term frosts and cold snaps in late spring - early summer, it is recommended to use greenhouses and frame greenhouses.

The reasons for the color change in cucumber leaves can be different. Most often, the problem is associated with a lack (or, conversely, an overabundance) of nutrients and microelements. Here it will be important to pay attention to the nature of yellowing - the measures taken will depend on this.

In general, all plants that are green are due to the fact that they contain Chlorophyll.

, In most cases, nitrogen. Here a complex of mineral fertilizers will come to the rescue. It will not be superfluous to add rotted manure to the soil before planting the plants.

... For example, powdery mildew, in which a gray-yellow bloom appears on the leaves. Also dangerous for cucumber plantings is the viral "green mosaic", which manifests itself in the alternation of dark green and light yellow spots on the leaf. Plants are often affected by root rot. The cause of the disease can be a sharp drop in day and night temperatures, as well as watering with cold water. You can fight diseases with drugs such as Bayleton, Ridomil Gold MC, Quadris 250 sc.

3. Yellowing of the cotyledon leaves of cucumber seedlings is considered quite common. In most cases it is

A common greenhouse pest of cucumbers is the whitefly. It sucks the sap from the plants, causing them to turn yellow and dry out.

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Why do cucumber leaves turn yellow in a greenhouse

In order not to question why cucumbers turn yellow in a greenhouse, it is necessary to take into account all of the above factors that affect the quality and fertility of this plant.

Powdery mildew

Lack of nutrition

Occurs with sudden temperature changes, lack of trace elements, improper fruit formation and high humidity. Between the veins on the leaves, brown or dark green angular spots appear, oily, with drops of mucus. At first, the petals of the flowers rot, then the ovary. The bacteria can cause rotting of fruits, as well as seedlings and cotyledons.

Fusarium wilting

Discoloration and yellowing of cucumber leaves are possible with insufficient or improper watering. Cucumbers are watered with settled warm water, regularly, deep enough so that water flows to both surface and deep roots, without flooding the plants, after 1 or 2 days, 1-2 buckets per square meter.

Seat selection

Root rot

More information can be found here. There is also a good article here.

If in a plant, for example, in a cucumber, the edges of the leaves begin to turn yellow, this tells us that there is no Chlorophyll in these edges.

Peronosporosis

2. The main reason for the yellowing of the leaves of cucumber plantings in greenhouse conditions is

3. Naturally, for planting in the open field, it is necessary to ensure a balanced

Due to lack of light

After treating the plant with a chemical, all the fruits from the cucumbers must be collected and discarded. It is not safe to eat them.

Pests

Various diseases and pests can be the culprits of why the leaves of cucumbers in the greenhouse turn yellow.

Rational nutrition of the soil at the time of digging in spring and autumn will enrich it with minerals. It is enough to add rotted manure, ash, superphosphates and fertilizers rich in potassium. Only the lack of these minerals leads to the fact that the leaves of cucumbers first brighten, then yellowing appears. This disadvantage also affects the fruits themselves - they begin to curl.

Downy mildew

Excessive moisture in cold weather and watering with cold water can lead to decay of the roots, the plants become sick and turn yellow. When watering cucumbers in sunny weather, try to keep water out of the leaves so as not to burn the leaves, which will cause them to turn yellow.

Many ovaries on the plant

Cucumbers can turn yellow even if the beds are not placed correctly. This culture does not like excessive lighting and high temperatures, which is why it is better to arrange cucumber beds so that the beds are in the shade at lunchtime. Observing the rules of crop rotation, the place for the beds must be changed every season, and the soil in the greenhouse must be replaced regularly.

There may be several main reasons at once: a lack of moisture in the soil, infertile soil, improper location of the garden (ideal is when a shadow falls on the cucumbers in the middle of the day), then sunburn can be avoided.

Poor pollination

Why yellow?

Non-compliance with the basic rules for growing plants

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Why do cucumber leaves turn yellow in open ground and in a greenhouse - Onwomen.ru

Watering mode

Causes of yellowing of leaves in seedlings. How to fight?

... This can be easily remedied by choosing a more suitable location for young plants without direct sunlight.

Another culprit for yellowing leaves on cucumbers is too frequent cucumber ovary. Experienced summer residents know that it is undesirable to leave more than 25 ovaries on one plant.This disease appears in cucumbers when infected with a spore-bearing fungus. Light large spots form on the leaves, which rapidly increase and spread to all seedlings in the greenhouse. If this disease is not treated, then it will manifest itself in the next season.

, Or peronosporosis, appears in greenhouses or under dense cover after heavy rains. On top of the leaves, oily spots of light yellow color appear, passing to the underside of the leaf; then a gray-violet bloom appears in place of the spots. The spots grow, merge, the leaves turn yellow and dry out. Bacteriosis can lead to the complete destruction of the crop. No pollination Optimal soil mineral content

Measures to help you avoid yellowing of the edges of the leaves of cucumbers: Because cucumbers don't have enough potassium.... Most often this is due to a violation of the watering regime. The rule says: it is necessary to water the greenhouse plantings of cucumbers with extremely warm, settled water. Some gardeners, in order to save time, water the plantings with a hose. In no case should this be done. On hot planting days, it is best to water in the early morning, and in cool weather - during the day. During the period of ovary formation, watering becomes more frequent.

... In addition to the above measures to combat yellowing of leaves, it is necessary to provide favorable conditions for development and fruiting for plants in open ground. 4. It is possible that the seedlings are simply Today, some varieties of cucumbers are known that, when grown in a greenhouse, are capable of producing a hundred or more ovaries. In this case, timely plucking will help to avoid yellowing of the leaves, otherwise the young ovary will delay the formation and ripening of fruits.

To minimize the chance of powdery mildew infestation, select fungus-resistant cucumber varieties for planting.Cold night temperatures are one of the primary reasons why cucumbers turn yellow in a greenhouse. Cucumbers are thermophilic plants that react very sharply to temperature changes. This happens especially often in central Russia, when the last frosts attack at night. To prevent this from happening, it is necessary to insulate the greenhouse itself, covering it with a film, and the plant itself, placing containers with water next to the seedlings. The water must be hot enough, because the temperature for the favorable growth of cucumbers must be at least + 22 ° C. Root rot

Yellowing of leaves in open field cucumber plantings

Plants can turn yellow when sowing cucumbers with artificial pollination and lack of access to them (in a greenhouse or closed greenhouse) by insects - pollinators Yellowing of plants can cause a lack or excess of minerals in the soil. The main building material for cucumber is nitrogen. With its lack, cucumber leaves brighten, turn yellow along the entire surface along the veins, then whips turn yellow, embryos, leaves fall off.The edges of cucumber leaves can turn yellow for several reasons. And this:

If you water your cucumbers well, everything will be fine. 3. In some cases, yellowing of leaves in cucumber seedlings is affected by 4. It can also adversely affect the color of cucumber leaves.

Lack of nutrition It is possible that the reason why the leaves of cucumbers turn yellow in the greenhouse is poor pollination. It is possible that you have purchased artificially pollinated varieties of garden crops.Another fungal disease that causes yellowing of the leaves on cucumbers is fusarium. The Fusarium fungus causes the plant's roots to die off, causing the leaves to turn yellow.

Lack of water and low humidity occurs when sowing in cold soil, with sudden changes in daily temperature, improper watering using cold water that has not been settled, after weeding, hilling and with burns. First, individual fruits and leaves wither, then everything turns yellow, and the plant dies.

With an excess of nitrogen, leaf pigmentation is observed. Small watering (if you notice this, then first of all you need to increase it) I think I was able to help you with the answer.

The appearance of pests

Causes of yellowing of leaves in cucumber plantings in a greenhouse. How to fight?

Lack of essential minerals in the soil

... Lack of nitrogen, calcium, sulfur, manganese can affect the color of the leaves. In this case, it is necessary to immediately fertilize the seedlings. Sometimes the unnatural color of the leaves is associated with an excess of minerals in the soil. Then the plants must either be transplanted into other pots, or (if the time has come) into a greenhouse or open ground.It is better to prevent yellow leaves on cucumbers than to look for its cause and methods of elimination afterwards. Observe the conditions for growing a garden crop, provide cucumbers with everything necessary for full growth, monitor the condition of the soil in the greenhouse and prevent the development of pathogenic fungal flora. Then you will definitely reap a rich harvest of cucumbers! If you notice that the cucumbers in the greenhouse have turned yellow and dry, the affected plants are easily pulled out of the ground, you need to change the contaminated soil. And plant other varieties of cucumbers next season.

The plant gives a signal that it lacks moisture by curling and yellowing of the leaves. With insufficient watering, the roots take moisture from the stem and leaves, so cucumbers turn yellow in the greenhouse. In this case, it must be remembered that for active fruiting, you need two watering a week. For one plant, 25 liters will be enough. warm water, and it will delight you with tasty and juicy fruits.Cucumbers can damage insects - pests that feed on leaves, stems and fruits, which leads to yellowing, drying and death of plants. You can fight them using correctly selected preparations.On each plant you need to leave no more than 25 ovaries, since one plant is not able to feed more fruits, they begin to dry out, turn yellow and fall off.

The change in color and the appearance of spots on the leaves without wilting can be indicators of a lack of certain elements: Long-term exposure of leaves in the sun (it has already been proven by experience that the sun "burns" the leaves, they turn yellow and dry out) I wish you a lot of cucumbers and health )

... For example, melon aphids can accumulate on the underside of leaves, causing them to turn yellow. Correct identification of the problem and timely adoption of measures (the use of specialized chemicals) will help to forget about pests forever.

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Why do the edges of the leaves of cucumbers turn yellow?

VC

Nadias

(Nitrogen, potassium, phosphorus). It is very easy to combat this phenomenon by applying mineral complex fertilizers to the soil.

5. In most cases, yellowing of plantings is associated

nastyastar

Who doesn't like to enjoy fresh and juicy cucumbers from their garden? Probably, there are few people who would deny themselves this pleasure. But before ripe cucumbers decorate the dining table, vegetables must be grown. And in this case, the gardener may experience some difficulties. If we are talking about a cucumber culture, then sometimes one of the problems of gardeners is the yellowing of planting leaves. Moreover, a gardener may encounter such a difficulty at any stage of growing cucumbers, from seedlings to plantings in a greenhouse or open ground. Let's find out the main reasons why the leaves of cucumbers take on an unnatural shade, and also decide how you can deal with this phenomenon.

In this disease, yellowing of the leaves begins from the bottom. Weakened plants are the first to suffer.

Excess ovaries

The main pests:

Lilka-g

Timely harvesting of fruits

Yellow edges on old lower leaves are an indicator of magnesium deficiency, on young ones - copper deficiency.

Lack of potassium / pests / poor soil

Most likely you are watering them incorrectly. If you water the cucumbers often, but with a small amount of water, then the water and nutrients will not reach the root system of the cucumbers and the leaves will immediately let you know about it. There is a possibility of overflowing the plants with water, and in this case the leaves will turn yellow, because then, from excess moisture, the roots begin to rot. Do not water during the peak of solar activity, water in the morning or evening. Fertilize at the correct dosage to avoid burning the plants with urea. Well, do not allow the formation of any fungi in the soil.

Proper care of cucumber plantings, as well as the timely identification of problems and their solution will save the leaves of cucumber plantings from yellowing.