In the winter and spring seasons, in the south of China, especially in the Yangtze River basin, eggplant, pepper, tomato and other eggplant vegetables are cultivated in protected areas, often due to adverse weather such as low temperature and rain, and they are susceptible to damping-off, blight, and bacteria. Nuclear disease, gray mold caused by inverted seedlings. According to the author's comparative test observations and production practices in recent years, several methods were proposed for comprehensive prevention and control of the inverted seedling phenomenon of eggplant vegetables. First, choose a good seedbed: seedbed election leeward sunny, well-drained, soil loose and fertile and 2-3 years have not planted eggplant vegetables in the field. The old vegetable plot (grain field) can be sprayed with 40% formalin 100 times 250 milliliters per square meter for 20 days before sowing, and then covered with a film for 5-7 days, and then uncovered and dried for 14 days. It is also possible to use 70% thiophanate methyl 6-8 g/m2, mix well with 10 kg of fine soil, apply 1/3 before sowing, and cover 2/3 after sowing. Second, seed disinfection: (1) soaking in warm water. The filtered seeds of fresh water were poured into hot water at 52° C., maintained at a constant temperature for 30 minutes, and washed with cold water. (2) Seed soaking. The seeds were pre-soaked in shallow water for 3-4 hours, then soaked for 15 minutes in 40% formalin 100-fold, removed for 2 to 3 hours with a wet gauze, and cleaned. (3) Chemical seed dressing. Use 70% pentachloronitrobenzene or 50% captan for seeding 0.3-0.4% of seed weight. Third, the fine tube seedbed: before planting enough nutrient soil, fine soil preparation, adequate application of organic fertilizer, pouring enough water bottom seedbed. Seeding can not be too dense, suitable for sowing 6-8 grams / square meter, after sowing seeds covered with fine soil cover, thickness 10 cm, and cover the film. Keep the bed temperature at 25-28°C during the day before emergence and not lower than 20°C during the night. After the emergence, remove the membranes and ventilate them in time. When 3-4 true leaves are selected, the cold-tail warmer heads are planted and used to cover the winter. Minimize watering at the seedling stage, and sprinkle some dry soil mulch after watering. Low-temperature cold weather, pay attention to cover straw insulation at night, to prevent frostbite; proper ventilation and ventilation at noon to reduce the temperature and avoid leggy. Continuous rainy days, can be installed in the seedbed infrared light or incandescent lamp, add light, reduce yellowing leaves; combined with disease prevention spray 0.3% potassium dihydrogen phosphate solution 5000-6000 times liquid. Fourth, rational application of the drug: the disease at the early stage of removal of diseased seedlings, concentrated deep. Blemishes can be treated with 58% metalaxyl Mn-Zn 500-600 times, or 75% chlorothalonil 600 times, or 72.2% Preclosure 400-fold; Bacterial seedlings mixed with damping-off and damping-off , with 72.2% Prokary water 800 times liquid + 50% thiram WP 800 times liquid control. At low temperature and high humidity, gray mold and sclerotinia often occur mixedly. It can be controlled with 50% fasting WP 1000-1500 times. Continuous spring yin and seedlings in the greenhouse can be used. Qing compound smoke agent fumigation, the amount of 250-300 grams per 667 square meters (1 mu), attention should not be fumigation in the shed, so as not to produce phytotoxicity.
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