Why cabbage seedlings turn yellow. Cabbage leaves turn yellow - what is behind this symptom? Why cabbage has yellow leaves how to save

There is nothing surprising in why cabbage seedlings turn yellow on your windowsill.

Growing it in an apartment is quite difficult. The main problem is the creation of a suitable microclimate. The next most important tasks are: proper care, disease control, pest control.

Microclimate

Cabbage seeds germinate quickly. If the seedling box is in a room where the temperature is above 22 ° C and there is only natural light, the seedlings of your cabbage turn yellow, quickly stretch out, become frail, unsuitable for planting in open ground.

For normal growth in the room, the temperature should be 10 ° C during the day and 8 ° C at night. At higher temperatures, the roots of cabbage develop poorly, because of this, nutrition worsens, so the leaves turn yellow, the stems become thin.

Advice! Strong cabbage seedlings are easier to grow on a balcony, in a spring greenhouse or greenhouse.

Lack of light is the second reason why the leaves of cabbage seedlings turn yellow. She needs at least 15 hours of daylight. It is necessary to illuminate seedlings of cabbage in the evening after five o'clock and in the absence of sun during the day. The lack of light is especially noticeable in the phase of formation of 2–3 true leaves. The lower leaves turn yellow at first, then dry out.

To create additional lighting, it is better to purchase an LED phytolamp. Seedlings will benefit from these modern lamps more than from other types of lamps, they are environmentally friendly, safe, and emit the spectrum of light necessary for plant growth. Leaves of seedlings that have turned yellow from poor conditions should be sprayed with an anti-stress drug:

• HB-101;
• Zircon;
• Epin-Extra.

They will help the seedlings.

Nutrient deficiency

Bad soil is another reason why cabbage seedlings turn yellow and dry out. It is easy to encounter such a problem when using garden land. She may be exhausted. The lack of nitrogen (N), phosphorus (P), potassium (K) in the soil leads to a deficiency of these elements in plant tissues, which is manifested by a change in leaf color.

Advice! Foliar feeding of cabbage seedlings is the fastest way to restore nutrient balance. Spray the cabbage with a solution of nitrophoska, diluting 15 g of the drug in 5 liters.

To eliminate the deficiency of nitrogen, potassium and phosphorus, feed cabbage seedlings three times before transplanting into the ground:

1. For the first feeding, add potassium chloride (1 g in total), ammonium nitrate (no more than 2.5 g) and about 4 g of double superphosphate to a liter of water. Plants watered under the root. Feed for 10 days after transplantation (picks).
2. Feed with ammonium nitrate solution 14 days after the first feeding (3 g/l).
3. The last fertilization is carried out before planting the cabbage in the ground. To prepare the solution, take a double dose of the same drugs that were used during the first feeding.

Advice! Pour the seedlings with plain water and only after that with a solution of fertilizers.

Pests

After examining the leaves, you can understand what to do if the cabbage seedlings turn yellow and dry out. Pests that have settled on young leaves suck out the juice, impair nutrition, violate the integrity of tissues, and spread infections. Yellow and dried leaves are the result of their vital activity.

In an apartment for seedlings, aphids and spider mites are dangerous. They can get into the box with seedlings in different ways, the most common: with planting soil, from indoor plants, from a bouquet of greenhouse flowers. The cruciferous flea is the most common reason why cabbage seedlings turn yellow after transplanting into the ground.

Aphid

Aphids can be easily seen without a magnifying glass. It lives on the underside of cabbage leaves. Adults are grey, cream or black and 1.5 to 2.5 mm long. The color and size depends on the type of aphid. The larvae hatched from the eggs are smaller in size. They reproduce at a high rate. A young plant may die if it is not helped in time.

Plants infected with aphids should be washed with soapy ash water. For cooking, take laundry soap and a little sifted ash. Sprinkle the soil after processing with ash. After 3 days, repeat the procedure. Stop processing after the healthy appearance returns to the seedlings.

spider mite

Ticks are small insects from 0.2 to 2 mm in various colors - from transparent yellowish to red. The duration of the life cycle depends on the temperature.

The higher the air temperature, the faster the insect develops and multiplies. Infected plants can be washed and treated with the Akarin biological product.

Diseases

If cabbage seedlings turn yellow due to a disease, what to do - treat or destroy, you need to decide quickly so that the infection does not spread to healthy plants. The most common diseases of cabbage seedlings: keel, blackleg. Both are very dangerous and untreatable. Sick seedlings need to be destroyed, dug up with a clod of earth. The soil is watered with a fungicide solution.

Blackleg

A common fungal disease. Spores may be in the soil. The disease is provoked by improper care of seedlings: temperature fluctuations, high temperatures, irregular watering, when the soil first dries up, and then it is poured abundantly. Acidic soil can also cause disease.

In diseased seedlings in the phase of cotyledons or the first 2 leaves, the part of the stem above the root first becomes thinner, then begins to rot. The plant stops growing and dies.

quila

The cause of the disease is a fungus that lives in the soil. It penetrates into the tissues of the roots, growths (thickenings) appear on them. The root part of the diseased seedlings rots over time, it completely lacks thin roots. Lack of proper nutrition leads to the death of young cabbage, adult cabbage grows poorly, forms small, sluggish heads or dies.

The bed on which the diseased cabbage grew should be cleaned of cabbage roots in the fall, spilled with a fungicide, and plant tomatoes, onions or garlic on it in the spring. It is believed that the combination of tomatoes and garlic in plantings has a deadly effect on the fungus and restores the soil in one season. For 3 years, any nightshade crops should be grown on the infected area: potatoes, eggplants, tomatoes, peppers.

Conclusion

In cabbage seedlings, most problems arise due to improper care. Yellow leaves on cabbage seedlings are a signal that your life is bad. Watch an informative video about the intricacies of growing strong cabbage seedlings:

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Everyone knows that the color of healthy cabbage leaves should be different shades of green, depending on its age and variety. But often gardeners are faced with the fact that the leaves turn yellow, or even take on a mysterious color - red, purple, blue ...

What does this mean, is cabbage always sick in this case, and how to eliminate the cause of such an unnecessary "rainbow" in the garden? Let's figure it out together.

Why do cabbage leaves turn yellow and dry

Most often, the reason for the discontent and anxiety of gardeners is that the leaves of cabbage seedlings or an adult head of cabbage turn yellow, wither, curl and dry out.

Usually, first of all, they sin on a lack of moisture, especially in hot weather. Yes, this option is possible and is easily corrected by adjusting the schedule for watering your beds. However, unfortunately, there are other, more serious reasons for yellowing cabbage - consider the most common ones.

For example, the advent of burrowing pests or soil larvae to the garden, which, in the process of life, gnaw the underground parts of the plant. These are bears with their broods, and nematodes, and larvae of Khrushchev (May beetles) or click beetles (wireworms). Of course, damage to the root system of cabbage inevitably leads to oppression of its aerial parts - stems and leaves, as a result of which they lose turgor and change color.

Not only underground pests can spoil cabbage leaves - the “work” of both flying insects and their caterpillars with equal ease leads to the appearance of yellow-brown spots, yellowing and wilting of plants. Aphids, scoops, slugs, soldier bugs, weevils, cabbage fly and others actively eat young cabbage leaves, disrupting their vascular system, which, in the event of a massive infection of the garden, leads to wilting and drying of plants.

What to do?

Keep a close eye on your plants, and fight, fight and fight pests again. Alas, it will most likely be necessary to apply complex methods of control, including preventive measures, manual collection of insects and larvae, and placement of traps, and the use of chemicals.

If there are no gnawing pests, perhaps your cabbage is ill with Fusarium?

Signs of this fungal disease are just the yellowing of the leaves and chlorosis between the veins in the lower part of the leaf, followed by mass wilting and leaf fall. Fusarium usually affects seedlings and adult cabbage grown in the open field. Most often, in dry, hot years.

To prevent this from happening on your site, choose cabbage varieties that are zoned and resistant to Fusarium ( Bronco, Kolobok, Amazon, Triumph, Vestry,Ammon, Santorino etc.), disinfect the soil in autumn with a solution of copper sulphate at the rate of 5 g per 10 liters of water, carry out preventive spraying of plants and spilling the beds with Fitosporin, Immunocytophyt, Agat-25.

Another unpleasant disease that can cause yellowing of leaves and bogging of cabbage (and other cruciferous) at any stage of its growth is keel.

What else can cause cabbage leaves to turn yellow?

Improper nutrition of plants. Or rather, a lack of potassium in the soil. With potassium starvation, immunity decreases, the tissues of cabbage leaves turn yellow and die off, as if from a burn, starting from the top and from the edges of the leaf blades.

By the way, about burns (real, not imaginary) - yellow and brown leaf burns may well appear on your cabbage as a result of improper treatment of plantings with pesticides.

If measures in the form of potash supplements are not taken in a timely manner, then the crop grows small, deformed or loose. As a rule, mature plants are less prone to this problem and, above all, cabbage seedlings turn yellow on depleted soils.

The same applies to any other similar discoloration of cabbage leaves, the appearance of spots on them, clarified veins, foci of necrosis, “marbling” - do not forget to check how the plant feeds. So, marbling of leaves of any color can be both a sign of a viral disease and a consequence magnesium starvation. In the latter case, the tissues between the veins of the leaves usually still die. Discolored tissue between the veins may signal lack of manganese in the soil, although the veins themselves remain bright green. lack of calcium in the soil leads to the suspension of plant development, cabbage leaves first turn pale, and then turn brown and curl. If the plant not enough boron, young leaves of cabbage seedlings from the petiole will become pale, their edges will also twist. At lack of molybdenum young leaves of cabbage are rolled up like a "spoon".

All changes in the appearance of cabbage associated with malnutrition require the right fertilizer.

Why do cabbages have purple, blue, or red leaves?

However, unhealthy yellowness is not the only “color” sign of cabbage malaise. The leaves of your vegetable crop, for one reason or another, may acquire other unusual shades.

For example, when nitrogen deficiency you will most likely observe how your cabbage first turns pale, and then reddens or even turns blue (less often) the leaves on the underside. After all, it is nitrogen, as experienced gardeners know, that primarily affects the normal growth of vegetative mass by plants and is responsible for its normal green color. Most often, this problem occurs in the presence of cold and rainy weather, as a result of which the activity of microorganisms is weakened, and nitrogen ceases to flow to the plant.

The situation is corrected by feeding cabbage with nitrogen-containing fertilizers. Remember only that excessive application of nitrogen to the soil in the second half of summer reduces the resistance of plants to bacterial and fungal diseases.

But it also happens that the cabbage does not have red, but rich purple leaves - who is to blame and what to do? In this case, blame again the lack of trace elements, this time phosphorus. Phosphorus starvation weakens the growth and development of the vegetable, delays the formation of a head. Cabbage leaves become smaller, darker, turn from green to purple. In the future, these purple leaves may turn yellow and dry out the edges. Especially often cabbage grown on sandy and sandy loamy acidic soils suffers from phosphorus starvation.

Therefore, you need to competently feed the cabbage with phosphorus fertilizers, but also do not overdo it, because. excess will adversely affect the development of the plant.

As you can see, most likely a change in the color of cabbage leaves indicates any problems in its cultivation or a lack of care. Moreover, the plant can turn yellow and wither even due to the stress suffered - inaccurate transplanting of seedlings, weather changes, an abundance of mechanical manipulations ...

Although cabbage is not the most capricious of garden crops, it is still worth observing agricultural technology - after all, you want to get strong crispy green heads of cabbage.

It often happens that cabbage seedlings develop normally at the initial stage, and then gradually or even suddenly begin to turn yellow. Why can cabbage seedlings turn yellow and how to prevent this?

In fact, there are plenty of reasons for the yellowing of cabbage seedlings, and only after determining them, you can start treating plants.

chapter 1. Causes of yellowing seedlings

Some gardeners associate the appearance of yellow leaves on young cabbage with improper watering - soil moisture should be moderate. The yellowness of the leaves can be caused by a lack of moisture, as well as its excess. In the first case, this happens during stable hot weather, but if the seedlings are watered with large doses of water, then as a result of rotting of the root system, yellowness may also appear on the leaves of the plants.

The second reason for this phenomenon is the lack of nutrients in the soil, and especially potassium. The lack of this element is usually determined by the yellowing of the leaves of not only cabbage, but also other vegetable crops.

Often, all kinds of seedling diseases are associated with exposure to various viral infections. It is known that during the development period the plant can be damaged by clubroot, which causes yellowing of the leaves and their slow drying. You can determine the disease in question by swelling on the root system of crops. Fusarium is considered the second disease that can affect young cabbage, it is caused by a fungus. The pathogen penetrates into the cells of the plant through damage to the root system and blocks the access of water and nutrients, as a result of which the plant dies and wilts.

Section 1. Diseases of cabbage seedlings

Good yields of any vegetable plant can only be obtained using quality seedlings, but young plants can be exposed to various diseases during the growing process.

Blackleg.

The most common disease of cabbage at the stage of growing seedlings is the black leg, which appears on the sprouts, root collar or subcotyl knee of the plant. The main symptom of the disease in question is the blackening of the stem, as a result, diseased crops bend down to the ground and rot. In the event of a focus of infection in the root zone, the cabbage begins to turn yellow.

In the predominant number of cases, the defeat of young plants is carried out from the root system. The causative agent of the disease can reside in untreated seed or affected soil. Other causes of the disease may be thickened plantings, improper watering of crops.

If infection of cabbage crops with a black leg is detected, the soil is loosened and the top layer is sprinkled with wood ash or lime. After the seedlings have recovered, the weakest cultures should be removed.

Keela.

This disease is considered one of the most dangerous, it can appear on all cruciferous crops, as well as some types of flowers. The infection affects the root system of the plant, you can notice it by a variety of swellings and growths. After the defeat of the roots, the plant will not be able to fully receive water and nutrients, the culture stops growing and withers.

The intensive development of clubroot on cabbage seedlings is facilitated by increased soil moisture, late planting of seeds and high soil acidity. There are no effective measures to combat the disease, so it is necessary to take preventive measures: prevent waterlogging, carry out liming in case of high acidity of the soil, and immediately remove the affected plants.

chapter 2. What to do if cabbage seedlings turn yellow

So really, what to do when yellow leaves are found on cabbage seedlings? First of all, determine the cause and it may not be as terrible as it seems at first glance. As for watering young plants, the soil should be moistened with water heated to room temperature as the soil dries out. Pay special attention to preparing the soil, the land for seedlings should pass air and moisture well, contain a sufficient amount of nutrients.

You can fight diseases at the stage of sowing seeds, they are pickled in a solution of potassium permanganate, and the earth is kept under the influence of high temperatures by calcining in the oven, which allows you to get rid of pathogenic bacteria.

Section 1 Prevention

Preventive measures should include:

• soil cultivation for seedlings by heating in the oven or impregnation with potassium permanganate;
• seed disinfection;
• disinfection of containers for the soil;
• constant monitoring of soil moisture.

Chapter 3. Video

Watch the video to learn how to avoid mistakes when growing cabbage seedlings.

Any changes in the appearance of plants are signals of problems that have arisen. If the cabbage began to turn yellow, is it dangerous, what can be done about it. The question is not idle, because there are many reasons for this phenomenon. Some vegetable diseases are too dangerous to ignore. If the cabbage leaves turn yellow, then immediate action should be taken. First of all, you need to find out why the cabbage leaves turn yellow, what the plant lacks. If the cause is a disease, what to do and whether it is possible to save the crop.

The plant is sensitive to any disturbances in the growth process. The question of why cabbage leaves turn yellow often arises. The cause can be either a lack of nutrition or a serious fungal disease.

When a cabbage leaf turns yellow and dries out, this may indicate the impact of the following factors.

• Lack of nitrogen in the soil. Impoverishment may be due to a violation of crop rotation, when the soil was cultivated by the same crop. If you cultivate cabbage for a long time in one area, the soil will become poorer and degradation of subsequent plantings will occur, during which the crop may simply dry out. Such consequences can be caused by elevated temperature, or if the beds are not light enough.
• Unsuitable soil type. Not all types of soil are suitable for growing cabbages. For example, when trying to cultivate on sandstone, the plant will sprout, but the shoots quickly become sick and weak. Leaves wither, turn yellow and fall off.

• Insufficient watering leads to drying and death of the roots. The leaves begin to turn yellow, the plant gradually weakens and dies. If the summer is hot and the sun is merciless, the plants may also begin to turn an unhealthy yellow color.
• Excessive watering is also harmful to the plant. The roots begin to rot, trace elements from the soil cease to flow into the leaves. The edges of the leaves turn yellow and begin to curl, and then dry out.

Any of the above factors causes a partial loss of the cabbage crop. Measures to improve the soil and change the irrigation regime must be implemented as soon as possible. After discovering the fact of yellowing of the leaves, all means must be used so that the culture has time to recover and produce a crop before the onset of winter.

Important! To prevent fungal diseases, crop rotation should be observed, returning plants of the same species to their original planting site no earlier than three years later.

The influence of viruses and pests

Yellowing of the leaves in addition to the external environment is also affected by microorganisms and pests. The most common are the following reasons.

Due to the infection of crops with pests or infection, changes appear on the shoots, the leaves of the cabbage turn yellow. Often after treatment, the plants continue their normal growth in the garden and produce a crop. But it is necessary to take it seriously and monitor the signs of the disease in a timely manner when yellowness appears on the plants.

Important! To obtain a guaranteed yield, hybrid varieties should be planted that are immune to common cruciferous plant diseases.

How to cure cabbage from yellowing

If the leaves turn yellow and sluggish, this is a serious problem. The plant gives you a signal that its life processes are under threat. It is important to identify the causes and deal with them with the right methods. The following steps must be taken.

• First you need to carefully examine the soil and cabbage for uncharacteristic deviations. To more accurately determine the cause of the disease, remove one of the plants from the soil, pay special attention to the condition of its roots and examine the edge of the leaf. Check the temperature conditions, see if the sun illuminates the plants.
• Cabbage turns yellow if there are signs of depleted soil, or crop rotation rules were not followed. In this case, you need to add chicken manure. It contains nitrogen and trace elements important for cruciferous plants. After enrichment of the soil, the cabbage, whose leaves turn yellow and dry, begins to produce fresh green shoots.

• If the soil dries out, you need to establish regular watering. If the soil is oversaturated with moisture, on the contrary, it is necessary to limit watering and ensure regular loosening so that the soil dries out faster.
• Against fungal diseases of kale, such as powdery mildew, Phytophtorin and Ridomil Gold should be used. Against other infections, a less aggressive method is suitable; you can water the crops with a 1% solution of Bordeaux mixture.
• In the case of pests, plants must be treated with systemic fungicides. For this purpose, the preparations Benomyl, Tekto, Topsin-M are suitable. It is also helpful to sprinkle yellow leaves with ashes or charcoal to prevent further pest attacks.

Following the above tips will help you quickly solve the problem of yellowing leaves and save your crop.

In order to prevent future crop losses, the following folk recommendations must be observed when cultivating cabbage.

• Do not plant diseased seedlings, so as not to infect the soil. Remove yellowed plant residue from the soil from the soil, as the fungus can remain viable in the soil for several years.
• Treat the soil with lime at the rate of 1 kg per 4 square meters. m to enrich its composition.
• Regulate soil moisture. Do not allow to dry out and prevent waterlogging of the soil. Try not to water the plants with cold water, which is why re-infection with fungal infections is possible. Green cabbage requires the use of mostly warm water for its irrigation.

Most vegetable growers also blame the cabbage fly for the appearance of yellow leaves on cabbage. But if signs of these sores on the roots are not found, then the cabbage turns yellow, most likely from an unbalanced diet.

Yellowness on cabbage most often indicates nitrogen starvation.

After feeding with saltpeter or urea, the vegetable is usually taken to actively grow huge burdock leaves, and heads of cabbage are poured right before our eyes. Instead of mineral, you can use organic top dressing. But keep in mind that the effect of them will not appear so quickly.

The main rule is to know the measure, because an excess of nitrogen increases the likelihood of developing diseases and pest attacks. And the heads of cabbage begin, lose and become unsuitable for long-term storage.

You should not be limited only to nitrogen fertilizers, as cabbage turns yellow even if there is little in its nutrition.

Although the need for this element is somewhat less, its shortage threatens with great trouble. Heads of cabbage are poorly tied, or completely stop gaining weight. In this case, it is better to carry out a combined nitrogen-phosphorus top dressing. In the presence of phosphorus, plants absorb nitrogen better, so you will get a good result from your efforts.

Deficiency of cabbage plants is not terrible, since this element is abundant in most soils. But if the leaves of a vegetable begin to turn pale and die off from the top, I advise you to treat the cabbage with potassium sulfate.

With the appearance of yellowness on the leaf apparatus of cabbage, magnesium starvation also begins. If the leaves are pale, and the veins remain bright green, then most likely you are dealing with a lack of manganese.

The balance of trace elements in the soil depends on its type and acidity.

Please note that even with balanced top dressing, cabbage will not be able to absorb macro and microelements from the soil if the soil is in the garden. The simplest, cheapest and most effective way out of the situation is the annual and strictly dosed liming of garden soil.

On loams, cabbage usually does not lack trace elements. But on sandy and sandy soils, the vegetable grower should regularly enrich the soil with complex ones. At the slightest sign of nutritional deficiencies, I advise foliar feeding.

These are the main reasons why cabbage turns yellow. This garden lady has a notable appetite, but she should be fed not so much healthy as healthy.