You have planted seedlings, take care of it, water it well, but once you found that the leaves of the tomato seedlings turn yellow . This is the first warning of the plant that something is wrong with it. It is worth paying attention to if in the future you do not want to lose most of the planned crop.
Why seedlings turn yellow
Quite often, gardeners have to deal with many diseases that affect the crop. However, scientists conducted a series of experiments and found that the leaves of tomato seedlings turn yellow for several reasons.
- Instability of the temperature regime, sudden changes can affect the seedlings. To restore, start observing the ventilation mode.
- Lack of light can also affect the yellowing of the leaves. Sunlight is essential for photosynthesis, so increase its access to the plant.
- Lack of important nutrients in the soil leads to stunted plants. To avoid this, simply fertilize the soil with nitrogen-containing fertilizers or cow manure (in a ratio of 1:10).
Before planting new tomato seeds, conduct their processing of races
potassium permanganate (potassium permanganate). Even a medium-strength solution will be able to neutralize seeds from possible pathogens, will provide additional protection, significantly reducing the risk of disease. With this solution, with the help of a spray gun, young shoots of seedlings can also be sprayed.
The "adult" seedling turns yellow
Sometimes even after carrying out all the necessary preventive work after planting, the leaves of the tomato seedlings turn yellow in the soil. In this case, you need to check a few more reasons for the appearance of yellow leaves.
If the plant discards only the lower yellowed leaves, then this is a normal natural process. Thus, tomatoes get rid of unnecessary ballast so that all the forces and juices go to the formation of inflorescences and fruits.
The situation is different if the leaves of tomato seedlings turn yellow not only lower, but also upper, and the whole plant looks weak and lethargic. The reason for this may be a fungal disease (fusarium). The main distinguishing feature of this disease is the cracked stem in places and its blackening.
Damaged plants can no longer be saved, so dig them up and burn them, and to prevent the disease, it is better to treat the remaining seedlings with biological products. To neutralize the soil, add fertilizers rich in potassium and phosphorus.
Even the best tomato varieties can be susceptible to a disease such as late blight. The appearance of brown spots on the leaves, yellowness and drying out indicate that the plant is infected with this disease. The virus can easily winter in the soil on parts of plants, and in the spring it infects young seedlings. To avoid the disease, treat the tomatoes with fungicides, Bordeaux liquid, and also reduce the soil moisture (use drip irrigation for watering).
Remember that it is better to prevent the occurrence of the disease than to eliminate it later. Timely processing of tomato seedlings with proper care will allow you to collect a rich harvest of tomatoes.