The first is a reasonable rotation. In the same area, it is not appropriate to plant green shallots. It should generally be changed every year. In the absence of rotation conditions, it should not be continued after the occurrence of rust.
The second is to apply base fertilizer before transplanting. Each acre of green onions can be used to compost 3,000 tons of pig manure, 45% of NPK fertilizer 25 kg, and after turning ripening uniform, and then transplanting green onions.
The third is to improve the disease resistance of onion strains. In the spring and autumn, during the period of easy disease, ammonium bicarbonate 15-20 kg should be applied per acre to promote the growth of green onions and resist diseases.
The fourth is the timely use of medication. Generally can be used 3000 times 25% triadimefon EC, plus one thousandth of washing powder, use a sprayer to spray fine mist or use carbendazim and triadimefon combined with detergent to prevent and cure. After the first application, control should be repeated every 7-10 days. In the prevention and control, no matter which kind of drug is used, detergent powder should be added to improve the control effect.
The second is to apply base fertilizer before transplanting. Each acre of green onions can be used to compost 3,000 tons of pig manure, 45% of NPK fertilizer 25 kg, and after turning ripening uniform, and then transplanting green onions.
The third is to improve the disease resistance of onion strains. In the spring and autumn, during the period of easy disease, ammonium bicarbonate 15-20 kg should be applied per acre to promote the growth of green onions and resist diseases.
The fourth is the timely use of medication. Generally can be used 3000 times 25% triadimefon EC, plus one thousandth of washing powder, use a sprayer to spray fine mist or use carbendazim and triadimefon combined with detergent to prevent and cure. After the first application, control should be repeated every 7-10 days. In the prevention and control, no matter which kind of drug is used, detergent powder should be added to improve the control effect.
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