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浙江省水稻螟虫主要有三化螟、二化螟和大螟。三化螟主要为害单季晚粳稻、中稻和连作晚稻。近来改变栽培制度,在杭嘉湖晚粳地区和浙东中秈稻地区,因改制后形成混栽,三化螟为害严重,一般枯心率在20%以上,重者达62.99%。二化螟主要为害晚粳稻和双季间作稻,晚粳稻被害早期形成变色叶鞘和枯心,后期造成半枯穗,重者半枯穗达3成以上;至于为害间作晚稻,往往造成无收。1956年我们对666
Rice stem borers in Zhejiang Province mainly include Borer, Chilo suppressalis and Sesamia inferens. Borer borer mainly damage single-season late japonica rice, middle-season rice and continuous cropping late rice. Recent changes in the cultivation system, late Japonica Hangjiahu area and middle eastern Indica rice area in Zhejiang, due to the formation of mixed planting after transformation, Borer borer serious damage, generally more than 20% dry heart rate, weight of up to 62.99%. Chilo suppressalis mainly infects late japonica rice and double-season rice, and late japonica rice damages the early formation of discolored leaf sheaths and withered heart, resulting in half-dead ear in the late stage and over 30% in severe cases. As for late rice intercropping, it often causes no income. In 1956 we were right 666