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 greenhouse needs heat preservation, little ventilation, and a high degree of sealing. The problem of high 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 measures to control tomato gray mold: First, 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. Third, the petals and stigma attached to the fruit are removed in time. Fourth, the diseased plants and diseased fruits should be removed and destroyed in time. Alternatively the following Chemical control: 50% procymidone WP 1500 to 2000 times, or more than 40% sulfur SC 400 times, or 50% Iprodione WP 1000 to 1500 times, or 70% formamide Kitobuzin 800 to 1000 times liquid, etc. 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.
Author: Cao Wanping
Source of information: Farmers Daily
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