2. Select disease-resistant varieties and strictly control seedling clearance; the varieties promoted in the market are high-resistant leafy mildew 15, Jiafen 16, Jiafen 17, Zhongza 7, Shenfen 3, Jiahong 15, etc. , can be adapted to local conditions, the choice of planting. 3, seed disinfection: the introduction of seeds need to be seeded, soaked in warm water, the use of seeds and bacteria heat resistance differences, choose to kill both inside and outside the seeds of bacteria, without damaging the vitality of the seed temperature disinfection. Tomatoes grown in greenhouses should be soaked in warm water at 55°C for 30 minutes to remove pathogens inside and outside the seeds. After removal, they should be cooled in cold water and soaked in potassium permanganate for 30 minutes. After removing the seeds, they should be rinsed with water several times. Dry germination sowing. 4, high temperature stuffy shed: Select sunny noon time, take about two hours of high temperature treatment of 30 ~ 33 °C, and then ventilation and cooling in time, the pathogen has a better control. Strengthen the management of greenhouses and timely ventilation, properly control the watering, and promptly ventilate and reduce humidity after watering. The use of dual ridge and film-mulching, under-mulch irrigation methods, in addition to increasing soil moisture, can also significantly reduce the air humidity in the greenhouse. Inhibition of tomato leaf mold and re-infection, and mulching can effectively prevent the spread of bacteria in the soil. According to the weather conditions outside the greenhouse, through reasonable ventilation, as much as possible to reduce the greenhouse humidity and leaf condensation time, the disease has a certain control effect. Pruning in time and removing the leaves of the lower part of the plant as much as possible can also increase ventilation. 5. In the early stage of disease, 10% chlorothalonil aerosol 300-350g, or 30% chlorothalonil aerosol agent 200-250g can be used. When the greenhouse is closed in the evening, the pesticide is placed evenly and then ignited from inside out, usually in In the evening, the next day, the smoke was released. Use once every 10 days. (2) Powder spraying method: In the early stage of disease, 5% chlorothalonil dust is 1 kg per mu, and once again every 10-15 days. 6. Biological agents sprayed at the time of onset: 2% agricultural anti-120 water agent 200 times liquid; 4% agricultural anti-120 water agent 600 times liquid; 20% Wuyimycin water agent (Bo-10) 150 times liquid
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1. Rational rotation: More than three years of rotation with non-solanum crops to reduce the number of bacteria in soil.