Answer: The onion may be affected by Fusarium wilt. The pathogenic bacteria invade from the root wound or root tip cells, and the disease occurs most seriously when the daily average temperature rises to 24-28 ℃, and the relative humidity is more than 80%, especially when the soil moisture content is high. The disease develops rapidly. Low-lying land, lack of fertilizer, and lack of phosphorus and potassium fertilizer, the soil is sticky, the soil is acidic and the disease is serious when unripe fertilizer is applied.
When a diseased plant is found in the field, it is immediately irrigated with a chemical solution for prevention and control. 50% carbendazim wettable powder 500 times solution, or 60% Fangbaobao wettable powder 600 times solution, or 5% bacteriotoxic water solution 400 times solution for irrigation , Each plant is irrigated with 100 ml of diluted liquid medicine, and then irrigated once a week.
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