This year's warm winter phenomenon is evident. "Warm winter" induces Botrytis cinerea, the most serious disease. Control methods: (1) Agricultural control. Appropriate application of phosphorus and potassium fertilizers, improve plant disease resistance. Promote drip irrigation and under-membrane irrigation techniques to prevent flooding. At the beginning of the disease, the remaining petal and stigma should be removed in a timely manner to remove diseased leaves and diseased fruits and to remove diseased plants to prevent the spread of disease. (2) Ecological control. To increase temperature and eliminate humidity as the goal, strengthen ventilation management. The specific approach is: First, close the shed to warm up in the sunny morning; when the temperature reaches 28-30°C, the top wind will continue to be released after one hour, and continue to release the air at noon, and the temperature will be maintained at 20-25°C. The vents were closed at the temperature of 18-20°C in the afternoon, the night temperature was maintained at 14-16°C, and the relative humidity was maintained at 70-80%. Cloudy days also have to be ventilated for short periods at noon. (3) Chemical control. Before planting, 50% Suo Keling wettable powder 1500 times or 50% Carbendazim wettable powder 500 times sprayed seedlings to prevent bacteria from entering the greenhouse. In the early stage of disease, 50% Suo Keling wettable powder 2000- 3000 times liquid, 45% Tektronix suspension agent 3000-4000 times liquid or 50% acetaminophen wettable powder 1500 times, spray once every 7-10 days, spray 3-4 times. Botrytis cinerea is easy to produce drug resistance, and the amount of drug and application times should be reduced as far as possible, and attention should be paid to rotation and alternation of medication.
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