Summer cabbage to prevent viral diseases
Viral disease, soft rot, and frost toxic disease are the three major diseases of summer hot Cabbage. In recent years, the occurrence of viral diseases is the most serious. Its toxic sources are wide: Cucumber mosaic virus, tobacco mosaic virus, etc. At present, the virus can be basically contaminated with cabbage; the damage is heavy: the general seedling stage is yellow, the veins, and the shrinkage can not be included in the ball. The diseased leaves of the plant are brittle, shrinking, and unintentional, and the formation of gray-brown plaque on the leaves affects yield and commerciality. Cabbage virus disease mainly relies on poisonous aphids and leaves to rub juice to spread poison. High temperature and drought, especially under high night temperature conditions, is a strong external condition for infection. Before the 7-leaf stage, it was the most vulnerable period of infection and disease. Control method: 1 , watering, not seedlings: adhere to the principle of Sanshui Qi Miao, Wushui Ding Miao, then every 2 to 3 days after pouring water, one to promote the end, watering time is divided into the best in the evening, reduce the night Warm, reduce respiratory consumption, and ensure the healthy growth of the vegetable plants. 2. Control nitrogen and increase phosphorus and potassium, promote strong seedlings: base fertilizer should be applied at one time, apply 5 kg of biological potassium fertilizer, 50 kg of potassium sulfate compound fertilizer, and 15 kg to 20 kg of ammonium bicarbonate. 3, timely treatment, eliminate the source of poison: found aphid immediately spray control, in the migratory period of the wing scorpion should be 3 days to 5 days of prevention, available 20% chrysanthemum emulsifiable oil 800 times ~ 1000 times liquid or 20% cyan long Wet powder 800 times liquid spray. Adding 0.3% potassium dihydrogen phosphate to the spray can improve the efficacy and enhance the disease resistance of the vegetable. 4, found that the central diseased plant should be immediately removed to prevent infection, and sprayed with virus A500 times liquid or phytopathogenic 500 times ~ 800 times liquid for prevention and treatment. Jiangsu Tiankang Food Co., Ltd. , https://www.tiankangfood.com