The low temperature and high humidity environment is easy to cause tomato gray mold disease . When the season is high temperature, tomato gray mold disease is very easy to occur, and prevention measures should be taken.
Botrytis cinerea is mainly harmful to flowers and fruits, and can also damage leaves and stems. Young fruit is more seriously affected, and most of the stigma and petals are infested first, and then transferred to the fruit. The fruit expands from the stalk to the fruit surface. The pathogenic peel is grayish white and soft rot. The disease minister has a large amount of gray-green mold layer. When it is serious, the fruit falls off and becomes rigid after water loss. The disease of the leaves begins from the tip of the leaf. The lesions expand inward in a "V" shape. The initial water stains are light brown, and there are inconspicuous deep and shallow patterns. When wet, the surface of the lesions can produce gray mold and the leaves die. . Stem infection, produce water-stained small spots, and then rapidly expand into an elliptical shape. When wet, the surface is gray-brown and mildewed. In severe cases, the plants above the diseased part will die.
Prevention:
Agricultural control: It should be based on temperature increase, water control, air release and humidity reduction. It should not be flooded with large water to reduce dew condensation in the field; remove diseased fruits and diseased leaves, and pay attention to plastic bags to cover diseased fruits and diseased leaves. It can be removed to avoid improper handling of the disease, spread the disease, especially after the tomato is pulled, thoroughly clean the field, thoroughly disinfect the plant before planting the next crop, and prevent the gray mold pathogen from infesting the crop.
In the case of even snowy weather, spray medicine should be changed to rotate the smoked medicine. Even in the snowy weather, the humidity in the shed itself is very large. If the method of spraying the liquid is used to prevent the disease from happening, one will further increase the humidity in the shed, which will aggravate the disease. Second, after spraying, the tomato will be tender. Ye Yizhong is harmless. Change the spray to smoked drugs, not only can avoid the adverse effects caused by spraying, but also for the large amount of pathogen spores of Botrytis cinerea, the spray easily spreads the spores of the pathogens, and the disease prevention effect is poor. Take smoked medicine and prevent disease. You can use 100-speed smoke agent and gray mold nucleus to clean it once. The fumigation time is 7-8 hours, 5-7 days, and the medicine is rotated to avoid the resistance of pathogenic bacteria, thus improving the drug effect.
In sunny weather, chemical control is carried out in the early stage of tomato gray mold . The drug is as follows: fungicide, carbendazim, 50% kelican 1000 times solution, 50% chlorhexidine 1000 times solution, Wanmuling 800 times solution, 40% Shijiale Suspension 1200 times solution, 65% methicillin WP 1000-1500 times solution, sclerotium net 800 times solution, 75% methyl thiophanate 800 times solution, 45% Tecaux suspension 3,000 times solution, 60 % Anti-mildew ultra-fine powder 500 times solution, 2% Wuyincin water 150 times solution, the above agents are used alternately, once every 5 days, continuous spraying 2-3 times.
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