甜菜夜蛾在我市1年发生5代,以二、三代为害较重,第三、四代世代重叠严重。幼虫具有临时群集性、假死性,畏强光,寄主广,抗药性强;成虫具有迁飞性,繁殖能力强,各虫态发育历期与温度呈正相关。 Spodoptera exigua occurred in our city for 5 generations in one year, with two or three generations of serious damage, the third and fourth generation generations overlap seriously. The larvae have the characteristics of temporary cluster, pseudophase, fear of glare, wide host, strong resistance; adults have migratory behavior, reproductive ability, developmental stages of each insect state and temperature were positively correlated.