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Chinese cabbage downy mildew
Symptoms: The disease mainly damages the leaves. The lesions are pale yellow or yellow-green lesions, and are yellow-brown after enlargement. They are polygonal or irregular. When the air is wet, a white to grayish creamy mildew layer develops in the diseased part of the lobe. Prevention: 1. Selection of disease-resistant varieties, Chinese cabbage varieties of anti-virus disease are generally resistant to downy mildew, can be selected according to local conditions. 2. Seed dressing, seed dressing with 0.4% seed weight 50% thiram WP or 75% chlorothalonil wettable powder or 0.3% seed weight of Apron 35% seed dressing. 3. With non-cruciferous crops every year round, appropriate sowing, such as the encounter high temperature and drought years, Chinese cabbage should be appropriate late sowing, hybrid resistance is stronger than the farmers, the sowing date can be arranged first. 4. Chemical control: Central diseased plants were found in the field, and they were immediately removed and sprayed for prevention and treatment. The prevention and treatment at the end of the rosette was completely carried out. In order to facilitate the prevention and control at the end of the period, every 6 to 8 rows of vegetables can be left blank for easy control. The agent may use 40% triethylphosphonic acid aluminum (ethylaluminophosphate) wettable powder 200 to 300 times, 70% calcium aluminum phosphorus manganese zinc wettable powder 500 times, 70% chlorothalonil wettable powder 600 times or 72% Cream Urea Manganese Zinc (Ke Lu, Ke Kang Ling, Keshuang Cyanide) 800-1000 times liquid, every 667 square meters with 150 million live spores / g Trichoderma WP 267 g water 50L spray, every 5-7 days Spray 1 time. The occurrence of downy mildew is closely related to the virus disease. Therefore, these two diseases should be taken into account in the prevention and treatment in order to receive a good control effect.