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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
(a) Select disease-free seed and seed treatment: Select disease-free plots to retain seed, freshly sow seeds soaked in warm water at 50°C for 25 minutes, and sow after cooling.
(b) Strengthening the management of farmland: Select land plots with high topography, good drainage, and ventilation. 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.
(III) Chemical control: spraying prevention and treatment at the early stage of onset, spray once every 7-10 days, and spray 3-4 times, the commonly used agent is 1:1: 240-300 Bordeaux mixture, 40% EB aluminum wettable powder. 200-300 times, 25% metalaxyl WP 500-1000 times, 75% chlorothalonil wettable powder 500-600 times, 65% zeocin zinc WP 500-700 times, 64% antivirus, M8 Wettable powder 500 times, 66.5% Preclosures 700-1000 times.
White rust prevention and control technology of spinach
First, two to three years of rotation with other vegetable varieties.