The pathogenic botrytis cinerea was Botrytis cinerea, a fungus belonging to the subphylum Fungi. The main infestation of stems and leaves and fruits is a disease that affects the yield. After the leaves have become infected, they have "v"-shaped water immersion along the leaf veins from the tips of the leaves or leaves, and become light brown afterwards. Sometimes there are off-white mildew on the lesions. The fruit was more than self-mutilation, or the stigma was the first disease. The diseased part was water-stained, white-green, and slightly sunken. The diseased part of the disease was gray and white. After surface stem infection, it was water stained first, then light brown, slightly sunken, sometimes with ring veins or mildew. The main cause of surface stem disease is the re-infestation of the diseased tissue of the former crop in the soil and re-infestation under appropriate environmental conditions. In the prevention and control of gray mold in protected areas, ecological and chemical prevention methods can be combined. Ecological control: 1 Choose to water in sunny mornings, then warm up in time and let the air out. 2 Try to increase the angle between the film and the ground in order to enhance the intensity of light transmission and reduce water droplets and improve the disease resistance of plants. 3 Remove the broken flowers and stigma in time to reduce the initial infection. 4 often remove dust on the surface of the film to facilitate warming and light transmission. 5 Cover the mulch in time after planting to reduce air humidity. Chemical control: Advocacy is mainly prevention, and medication is started before flowering. The current ideal agent is the pyrimethanil series. The first is 40% Longli WP, which has internal absorption and fumigation, lower cost, and convenient storage in winter. The use of 1000 times the concentration, the second is 40% Shijiale 800-1000 times liquid. The use of these two agents should avoid spraying at too high temperatures and spraying too much, even spraying, so as to avoid burning leaves or brown leaves and other phytotoxicity. In order to prevent plant resistance, it should be used interchangeably with other pesticides. Other drugs such as, 50% polymyxin or 65% buprelin mixture and 40% sclerotin net wettable powder 400-800 times; 50% Suo Keling and 40% sclerotin net wettable powder mixture 400-800 Times of liquid; 50% Nongli Ling, 800-1000 times liquid, 50% acetaminophen 800-1000 times liquid and so on. The use of the above agents should be based on the degree of severity to grasp the use of concentration and interval time. In addition, it can also be combined with Propyuronic smoke agent fumigation control.
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