At present, the tomato has begun to enter the color-changing period in autumn and winter. However, due to the low outside temperature and short sunshine, the temperature in the shed is low, the air humidity is high, and the light is insufficient. In addition, the winter warm shed needs heat preservation, and there is little ventilation and sealing degree. Higher, the problem of large air humidity in the shed is more prominent, which leads to the occurrence and prevalence of gray mold in autumn and winter. The vegetable farmers must strengthen the prevention of gray mold if they want to obtain high yield of tomato. The most important measure to prevent and control tomato gray mold is to do a good job of ventilation, light transmission and humidity in the greenhouse, while keeping the temperature not too low. Secondly, it is necessary to strengthen the management of fertilizer and water to make the plant grow stronger and prevent premature aging; timely remove the petals and stigma attached to the fruit; and find that the diseased plants and diseased fruits should be removed and destroyed in time; (1) 50% speed Keling wettable powder 1500 ~ 2000 times liquid. (2) 40% polysulfurate suspension 400 times solution. (3) 50% chlorhexidine WP 1000-1500 times solution. (4) 70% methyl thiophanate 800 to 1000 times liquid, and the like. Spray once every 7 to 10 days, and spray continuously for 3 to 4 times. It is necessary to pay attention to the fact that germs are prone to drug resistance. The same agent should not be used during one growth period, and the above drugs should be rotated. More pesticide knowledge , please pay attention to China Pesticide Network Stainless Steel Bathroom Basket
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Prevention and control of tomato gray mold in autumn and winter greenhouse