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 onion fields can be used to compost 3000 kg of pig manure and 25 kg of 45% NPK compound fertilizer. After the ripening and mashing, the onion shall be transplanted and the new high fat film shall be timely sprayed after transplanting to remove pests and diseases. Moisture evaporates while reducing the slow seedling period.
The third is to improve the disease resistance of onion strains. In the spring and autumn, the ammonium bicarbonate should be applied 15-20 kg per acre to promote growth of the onion and resist disease.
The fourth is the timely use of medication. Generally can be used 3000 times 25% triadimefon EC, plus 500 times the new high-fat film, with a spray spray fine mist or carbendazim and triadimefon supplemented with 500 times the new high-fat film control. After the first application, it needs to be controlled again every 7-10 days. In the prevention and control, no matter which kind of medicine is used, a new high fat film should be added to improve the control effect.
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