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1.葱蝇幼虫蛆形,长7～8毫米,乳白略带淡黄色,此虫为腐食性昆虫,成虫对未腐熟的粪肥、发酵的饼肥及葱味有明显的趋性,幼虫有喜湿性和背光性,适于土中生活。每年发生3～4代,5月上旬成虫盛发,卵期3～5天,孵化的幼虫很快钻入鳞茎内为害。幼虫期17～18天。为害特点幼虫蛀入鳞茎或幼苗引起腐烂,以至叶片枯黄、萎蔫枯死。防治方法①施用腐熟有机肥,禁用生粪;③葱蝇发生后进行灌溉,能抑制幼虫活动和淹死部分幼虫;③成虫发生盛期,可用糖醋毒液诱杀成虫。诱杀液用糖0.5千克,醋1千克,水7.5～10千克,加0.1%敌敌畏或15～25克晶体敌百虫混匀即可,选择背风向阳地段,每隔8～10米放1大碗,667米~2放10～15个碗,诱杀并作为虫情预报;④撒施
1. The larvae of maggot larvae are 7-8 mm in length with a pale yellowish color. The insects are rotten insects. Adult insects have obvious tendency toward unfertilized manure, fermented cake and green onion, and the larvae have hygroscopicity and Backlight, suitable for life in the soil. Occurred annually 3 to 4 generations, in early May, adult hair full, egg stage 3 to 5 days, hatching larvae quickly drill into the bulb damage. Larvae 17 to 18 days. Damage characteristics Larvae bumble into bulbs or seedlings cause decay, as well as the leaves yellow, wilted dead. Control methods ① application of decomposed organic manure, banned excrement; ③ onion fly after irrigation, can inhibit larval activity and drowned part of the larvae; ③ adult peak occurs, can be trapped with sweet and sour venom adult. Trapping liquid with sugar 0.5 kg vinegar 1 kg 7.5 to 10 kg of water plus 0.1% dichlorvos or 15 to 25 grams of crystal trichlorfon mix can choose lee sunny section every 8 to 10 meters to put a bowl , 667 m ~ 2 put 10 to 15 bowls, trapping and forecasting as insects; ④ spreading