Tomato leaf mold does not infect fruit, and it mainly infects tomato leaves. At the beginning, some chlorotic spots appeared on the back of the leaves, and irregular or irregular moldy layers were formed on the later stages of the lesions. Commonly known as “black diseaseâ€, the leaves turned green and yellow in the corresponding parts. In severe cases, the leaves often appeared dry. Shrink. Leaf mould usually spreads upwards from the lower leaves of the plant. Usually the temperature of the greenhouse is 20°C to 25°C and relative humidity is about 85%. In the environment with weak sunshine, poor ventilation and excessive humidity, leaf mold is particularly serious. The disease seriously affects the physiological function of the leaves, which can lead to a significant reduction in tomato production.
Prevention and control measures: The prevention and treatment of drug use in the early stage of the disease can be controlled by spraying 10% of Shigao water-dispersible granules 1000 times and 47% Garethon WP 600-800 times. The spraying should be carried out in the morning. Pay attention to the leaves on the back of the medicine, spray it once every 7 to 8 days, and spray it three times. Pay attention to alternate medications to prevent drug resistance. When spraying, pay attention to the focus of the spray site. The pathogen of leaf mold is to survive on the soil in the diseased body. Tomato leaf mold begins to appear in the lower leaves of the plant. Tomatoes on the shed feet near the south of a shed were the first to develop disease. Therefore, when spraying, the focus should be on the lower leaves of the plants and the plants on the south side of the greenhouse. After the onset of the disease, spraying should focus on protecting the upper functional leaves of the plant. It is best to use it together with other fungicides to improve the bactericidal effect and to better control the spread of the disease.
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