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.
Soil testing and formulating fertilization According to the different fertilizer requirements of different growth stages of the tomato, soil testing and formula fertilization are adopted to avoid the use of a single fertilizer. Fertilization should be uniform. Immediately after fertilization, it should be watered or fertilized with water, so that the fertilizer dissolves into the soil as quickly as possible, reducing the The concentration of fertilizer is good for tomato absorption.
Increase organic fertilizers to minimize the amount of chemical fertilizers, increase the use of organic fertilizers, and conditional use of biological bacterial fertilizers in combination with organic fertilizers.
The improved fertilization method adopts stratified application and full-depth application of the method so that the soil fertility is integrated and the fertilizer is not exposed on the surface.
Remedial measures immediately after the emergence of fertilizer symptoms watering, general watering 2 to 3 times after the damage can be lifted, while spraying "Tianda-2116" and other plant nutrient solution, enhance tomato resistance.
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