Control of Botrytis cinerea in Greenhouse
When the humidity in the greenhouse shed is high, gray mold is easy to occur. After onset, the leaves gradually faded from the tip of the tip to grayish-brown to white spots, both on the positive and negative sides. After the enlargement, the leaves became elliptic or spindle-shaped lesions, and they merged into large dead spots. The air humidity is above 85% and the temperature is between 15°C and 20°C. Warm humid conditions are favorable for this disease. Pollution-free control measures: 1. Select disease-resistant varieties. Broad-leaf disease resistance varieties such as Xueyu, 791, Jiaxing Baigen, etc.; narrow-leaved cold resistant varieties such as workers, Huang Miao, Zhongwan No. 2 and so on. 2. Strengthen field management. Using a small amount of water to help increase the temperature of the ground. After each harvest, carry out 2-3 shallow cultivating soils to reduce the humidity in the shed. Timely release dampness. Grasp the time of harvest, harvest under conditions of low humidity and no dew, and then dry the roots and then earth. Timely removal of diseased leaves, increase fertilization, and enhance amaranth disease resistance. 3, chemical control. Each mu with 10% fast Ke Ling smoke agent 250 grams of smoke treatment, or 1000 grams per acre with 10% mildew powder spray, you can also use 50% Suo Keling wettable powder 1000-1500 times, 50% methyl Bujin WP 500 times, 70% mancozeb wettable powder 500 times spray control. In the initial stage of disease prevention and control once every 7 days, until the disease control.
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