旋幽夜蛾为杂食性害虫。通过室内外系统饲养观察,此虫在当地一年发生3代。以蛹在甜菜、胡麻、豌豆、首蓿等作物土壤中越冬,田间杂草、地埂下也能越冬,深度达10～20cm;前两代幼虫主要危害豌豆、胡麻、蚕豆等,第三代幼虫以危害甜菜为主。化学防治采用二嗪农1000倍液、水胺硫磷800～1200倍液喷洒,防效达90％。 Spodopterata moths are omnivorous pests. Observed by indoor and outdoor system feeding, the worm occurs in the local year 3 generation. The pupae in winter beet, flax, peas, first crop of alfalfa and other crops in the winter, field weeds, the ground can also wintering, the depth of 10 ~ 20cm; the first two generations of larvae major hazards peas, flax, broad bean, etc., the third generation Larvae harm beet-based. Chemical control with diazinon 1000 times liquid, ammonia, ammonia spar 800 ~ 1200 times spraying, control effect of 90%.