1. Seed disinfection Sterilized from disease-free plants, the seeds were sterilized with a constant temperature of 70°C for 72 hours, or soaked in warm water at 50°C for 20 minutes, and the seeds were picked out after drying. Pharmacy disinfection methods: 40% formalin 150 times liquid soaking for 1.5 hours; or 1 million units of 500 times streptomycin sulfate soaking for 2 hours, rinse germination after germination. 2. Rotation of non-guad crops for more than two years in crop rotation. 3. Use disease-free seedlings to prevent seedling disease. 4. Field management to strengthen field management, increase organic fertilizer, do not apply nitrogen fertilizer. During the growing period, once every 20 days, one ten-thousandth of a natural alizarin, Shuofeng 481, is sprayed to promote growth and improve disease resistance. After pulling, the stubble leaves are transported out of the field, buried or burned, reducing pathogens. 5. Prevent pests in time to reduce the route of infection. 6. At the early stage of spraying, the chemical is sprayed: 4000 times of the streptomycin soluble powder of 72%, or 300 times of 14% ammonia solution of copper, or 600 times of 50% of methyl copper wettable powder. Since the disease is often accompanied by an epidemic at the time of onset, it should be alternately sprayed with a 600-fold solution of 72% Kelu wettable powder. Once every 7-10 days, even spray 3-4 times. (Institute of Vegetables, Shandong Academy of Agricultural Sciences)
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