【摘要】 福建为害水稻的粘虫属种类,有粘虫Leucania separata Walker、白脉粘虫Leucania roseilinea Walker和劳氏粘虫Leucania loreyi(Duponchel)等三种。其中粘虫和白脉粘虫发生普遍,为害严重。白脉粘虫在福建一年发生六代,少数五代,冬季无明显的停育。成虫羽化后需要补充营养。有明显的趋化性和较强的趋光性。产卵于枯叶鞘内侧或枯叶端部。每雌一生最多产卵802粒,一般产卵150～300粒左右。初孵幼虫食心叶,三龄后食叶成缺刻,并能咬断小穗,影响产量。幼虫虫口密度纵然很大,亦无成群迁移习性。白脉粘虫在稻田终年发生,其周年群体数量变动规律,无“骤减”和“骤增”现象。第二代于6～7月(早稻后期)和第五代于10～11月(晚稻后期)发生数量较多,为害较重,而第五代是发生量最大和为害最严重的世代;也是一年中防治的主要时期。更多还原

【Abstract】 The grain army worm, Leucania roseilinea Walker, is an important pest of rice in South China. Besides rice, it also feeds to a lees extent on some gramineal weeds.Eggs are laid either within the dry leaf sheaths or on the apex of dry leaves. The larvae usually feed on the foliage and cut down the spikelet stalk of the rice plant. According to observations made in Foochow and Minhou, Fujian Province during 1962～1964,the grain army worm has 6 generations per year. The larvae, together with some pupae and adults, pass winter in the rice fields.There is no remarkable phenomenon of hibernation. The grain army worm cause significent injury in June-July during the second generation and serious damage in October-November during the fifth brood.更多还原