Onion is a crop with higher economic value, and it is a kind of vegetable that people like. It has high nutritional value and medicinal value. Due to the damage of pests and diseases, the onion quality is poor, which seriously affects its economic value. Five days before sowing and transplanting, the onion seedbed bed fell seedlings were sprayed with 72% Prec 500 times each time, 4 liters per square meter. For onion downy mildew, 90 ml of Carellies should be used for foliar spraying, spraying once every 7 days. Onion gray cream with Shijiale 800 times plus Haolik 3000 times spray, spray 7 days and then once again. Onion purple spot disease 43% good Lectra 3000 times fluid plus Antai 1000 times liquid, foliar spray, spray again about 7 days. The leafminer mu with 70% Miracle 2 grams plus 2.5% enemy killed 5-10 milliliters, can treat aphids, thrips, yellow dwarf disease prevention. For each kilogram of onion seeds, use 40 g of 60% high-fat wet seed dressing, or 60 ml of 5% fipronil suspension.
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