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甜菜夜蛾届杂食性害虫，可为害大豆、玉米、花生、甜莱、芝麻、蔬菜等门0多种作物n我省每年发生4－5代，以蛹在土中越冬，翌年3月出现成虫，为害盛期为7－8月份。一、发生情况初孵幼虫群居在叶背啃食叶肉留下表皮成透明小孔，2、3龄幼虫食员小，3龄以后分散为害，4、5龄幼虫食?
Beet armyworm will be omnivorous pests, can damage soybeans, corn, peanuts, sweet Lai, sesame, vegetables and other doors 0 variety of crops n 4-5 generations occur in our province, with pupa in the soil overwintering, the following year in March adult , Damaging the peak for the 7-8 months. First, the occurrence of newly hatched larvae community in the leaf back to eat the leaves leave the epidermis into transparent pores, 2,3 instar larvae are small, dispersed after the 3rd instar, 4,5 larvae eat?