The disease can be found at the seedling stage and adult stage. It can damage leaves, stems, flowers and fruits. The planting density in the field is too large, grows vigorously, shades, even in cloudy days, lack of light, lack of timely ventilation, high humidity, long dew condensation time, and severe disease.
Prevention and control methods do a good job in controlling the two key periods of flowering period and fruit enlargement period, and can achieve the effects of provincial labor and provincial medicine. 1 Clean the garden, remove old leaves, diseased leaves, diseased flowers, and diseased fruits in a timely manner, completely remove field sickness, and bring them out of the field. 2 Seedbed soil was disinfected, and the old bed soil was sowed with 50% thiram. Use 1-1.5 kg per mu. It is also possible to spray the soil with 50% thiram 400x or 50% fluocin 1000x during the preparation time. 3 Strengthen field management, regulate the temperature and humidity in the shed, and keep warm, wet, and airy. In the morning, try to keep it above 30°C. In the afternoon, increase the air release, reduce the humidity, and appropriately increase the temperature of the greenhouse at night to avoid condensation on the foliage. 4 Chemical control, when tomato spirit or 2,4-D is used for flowering, add 0.3% of fast-acting or acetaminophen to prevent botrytis. In the early stage of the disease, it was sprayed with 50% Sucrose 1500 times solution or 50% Propionin 1000 times solution and 50% Carbendazim 500 times solution. During fruit enlargement, spray with 65% metalaxyl or 50% polymyxin 1000 times, once every 5-7 days, spray 2-3 times. Rainy days can be used quick smoke agent or dust agent, neither increase the humidity, but also cure.
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