Why do cabbage leaves turn yellow
Gardeners, when planting seedlings in the beds, face many problems and questions. One of them is why cabbage leaves turn yellow.
Causes of yellow leaves in cabbage
The main causes of yellowness
Yellowing of cabbage leaves, leads to the death of the plant. To prevent it, it is necessary to determine the cause of the yellowing and start treatment:
- improper agricultural technology;
- violations of the rules of care;
- pests;
- disease.
Agrotechnics
The leaves of cabbage seedlings will definitely turn yellow if the diet is improper or unbalanced. The main mistakes in soil care:
- Lack of nitrogen in the soil. It is necessary for building up cabbage mass and head density. A small amount of the mineral leads to a weak set of the head of the head, slowing down its growth. Seedling leaves begin to turn yellow and after a while the culture completely dies.
- Lack of phosphorus. Regulates protein synthesis, plays an important role in plant development. Without proper cell division, there will be no desired shape and volume.
- Magnesium deficiency does not contribute to the growth dynamics of the root system. It can be identified by the pale color of the head of cabbage and its leaf plates.
Any mineral fertilization will not give positive results if the acidity of the soil is increased. Therefore, they first lime and then fertilize.
Insufficient care
In cabbage, the lower leaves may turn yellow due to insufficient sunlight. Landing space should be rational.
The crop can also grow in a well-lit area, have nourished soil, but the edges still turn yellow. Causes:
- severe spring frosts;
- poor loosening of the soil, the root system does not absorb the necessary nutrients;
- poor soil moisture and uneven watering.
- excessive drought, hot summer.
Strict care rules, timely planting and proper watering will help you grow your crop. Cauliflower, broccoli, and Chinese cabbage also respond to poor yellow leaves.
Pests
The activity of pests leads to the fact that cabbage turns yellow and part of the crop dies. The cabbage leaf is susceptible to attacks by caterpillars, aphids, cabbage butterflies, cabbage fly larvae, etc. If the culture begins to change color, it is worth examining the bottom row.
Infectious and fungal diseases
Disease can ruin crops
Infectious diseases are a very serious problem. Some diseases cannot be cured, and the crop cannot be saved either. Why do the leaves of cabbage seedlings turn yellow:
| Type of disease | Description |
| Fusarium wilting | Fungal disease. Begins to develop during the growing season of seedlings. The lower part of the plant loses its elasticity, turns yellow, withers and falls off. You can confirm the disease in the following way: cut the cabbage under the stem, the presence of black dots indicates fusarium. |
| Transposable wilting | Infection. It begins to develop at the stage of planting seedlings in open ground.Lack of timely control of powdery mildew leads to yellowing. Over time, they disappear and the plant dies. |
| Keela | Fungal disease. You can find out by the characteristic growths and seals that appear on the roots of cabbage. They take away all the necessary nutrients, so the bottom of the vegetable begins to turn yellow and disappear. |
If an infectious or fungal disease was found on the vegetable, then next year a cruciferous crop cannot be planted in this place.
Anti-yellowing
Fertilizing with urea and nitrogenous fertilizer will help the crop recover from nitrogen deficiency. Lack of phosphorus will make up for nitrogen-phosphorus nutrition. Organic fertilizers and pesticides will help.
Rescue from pests and diseases
Sprinkle the whole plant with wood ash. You can also sprinkle red pepper around the stem. Spraying with valerian solution will help from caterpillars.
The culture on which the fungal disease was detected should be destroyed. Treat the soil with copper sulfate (10 liters of water per 5 g of substance).
Infectious diseases, most often turn into an epidemic, it is difficult to save the crop in such cases. You can avoid the focus of the disease by disinfecting the seeds and soil with a solution of copper sulfate. Repeat the procedure for processing the culture after planting seedlings in open ground. Drops of liquid soap will help prevent the solution from dripping.
If the culture has turned yellow and is sick with keel, the infected plants are removed from the soil, the planting sites are disinfected with ash and copper sulfate.
Preventive measures
To prevent the lower cabbage rows from turning yellow, they carry out preventive procedures:
- process seeds in a hydrothermal way;
- the use of chemical fertilizers during the growing season of seedlings;
- do not stop spraying the culture with special preparations before harvesting;
- remove fungal spores from the soil;
- carry out proper care and watering.
Modern drugs Gamair and Alirin are suitable for the treatment of fungal diseases. Funds are actively used to stop the spread of the disease.
Dill, carrots, onions and nasturtium are planted near cabbage beds. Treat plants with tomato leaf tincture throughout the season.
Conclusion
Yellowing indicates growth or grooming problems. After examining the culture, you can find the cause of the yellowness. Compliance with all the rules, as well as recommendations, will not allow the vegetable to wither and crumble. Special tinctures, chemical solutions and fertilizers will help to cope with all external troubles.