First, two to three years of rotation with other vegetable varieties.
Second, before sowing, according to 100 kg of seeds 300 g 35% metalaxyl seed dressing sterilization; the third is the initial stage of the use of 50% methlyphos WP 6000 to 7000 times, or 72.2% Prec Agent 8000 times spray, 7 to 10 days to control once. Reinfection. Rainwater and insects can also spread, and whether seeds can be transmitted remains to be studied. It is cool at night, warm during the day, heavy fog re-exposed, and conditions of soil moisture are conducive to the occurrence and prevalence of the disease.
Third, control methods
1. Select disease-free seed and seed treatment: Select disease-free plots to retain seed, and sow newly sowed seeds in warm water at 50°C for 25 minutes, and sow after cooling.
2. Strengthen the management of farmland: Choose high-lying, well-drained and well-ventilated plots. Apply fertilizer and increase phosphorus and potassium fertilizers. Reasonable irrigation, not too wet onion. Discover the diseased plants and remove them in time. After the harvest, the diseased bodies were completely removed, concentrated treatment, and deep plowing were performed to reduce the source of bacteria.
3, chemical control: spraying the beginning of the disease prevention and control, spray once every 7-10 days, and even spray 3-4 times, the commonly used agents are 1:1: 240-300 Bordeaux mixture, 40% calcium aluminum phosphate wettable powder 200 -300 times, 25% metalaxyl WP 500-1000 times, 75% chlorothalonil wettable powder 500-600 times, 65% dexamethasone WP wettable powder 500-700 times, 64% antivirus, M8 Wet powder 500 times, 66.5% Prec lotion 700-1000 times.
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