Tomato early blight is also called summer blight or ring disease. In the rainy season, the tomato in the open field and the protected area is seriously damaged. Generally, the yield is reduced by 20% to 30%, and in severe cases, the yield is reduced by more than 50%. High temperature and high humidity are conducive to the occurrence and prevalence of the disease. The temperature in the field is 15 °C, the relative humidity is above 80%, and the temperature is 20 °C~25 °C. It is foggy or cloudy, and the disease develops rapidly.
The chemical control can be selected by using 64% antivirus WP WP 500 times solution, or 50% phorhin WP 1000 times solution, or 70% Mancozeb WP 500 times solution, once every 7 days. Even spray 3~4 times, 50~60 kg per acre. If the combination of early blight and late blight occurs, 58% metalaxyl·manganese zinc wettable powder 500 times solution can be used. If there are lesions on the stem, it can be applied with 50% phorhin WP 200 times, the effect is better.
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