In the early stage of tomato damage, the tomatoes showed symptoms of defoliated white or gray irregular spots on the surface of the leaves. With the development of the disease, the spots expanded. Some of the leaf spots on the leaves are greyish white, and the internal leaves are too late to fade green. They appear darker and darker in color and later perforated. Unlike diseases, there is no limitless increase in dead spots. The condition develops very rapidly under conditions of high temperature and drought, and the leaf margin is charred.
Control measures The main reasons for the damage caused by tomato fertilizer are excessive application of chemical fertilizers at one time, root damage, and reduced absorption capacity, which affects the leaves and leads to fertilizer damage. Tomato fertilizer not only cause a lot of waste, but also affect the normal growth of tomatoes, prevention and treatment of tomato disease should be hands-on. Fertilizer according to the different growth stages of the tomato needs to be different fertilizer, avoid using a single fertilizer, fertilization should be uniform, immediately after fertilization should be watered or fertilized with water, so that fertilizer dissolves in the soil as soon as possible, reducing the concentration of fertilizer, It is good for tomato absorption. Increase the organic fertilizer, reduce the amount of chemical fertilizers as much as possible, increase organic fertilizers, and apply biological bacterial fertilizers in combination with organic fertilizers.
Remedial measures immediately after the emergence of fertilizer symptoms watering, general watering 2-3 times after the damage can be lifted, while spraying "Tianda-2116" and other plant nutrient solution, enhance the tomato's resistance.
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