一、前言 玉米螟是嫩江地区主要粮食作物玉米、高梁、谷子上的重要害虫。发生世代,克山县以北为一代区;南部的泰来县属二代区;齐齐哈尔市是一代区与二代区的过渡地带,属不完全二代区。发生危害的产量损失以第一代为主。玉米螟发生量,历年变化很大。有资料以来,玉米百株虫量在150头以下的轻发生年占54.5％,150—300头的中等发生年占27.3％,超过300 First, the preface Corn borer is the main food crops in Nenjiang corn, sorghum, millet on the important pests. Occurrence of generations, north of Keshan County for the first generation area; southern Tailai County is the second generation area; Qiqihar City is the transitional area between generation and second generation, is not completely second generation. Hazardous production loss to the first generation. Occurrence of corn borer, great changes over the years. Since the data was available, 54.5% of young corn with one hundred insects were born under the age of 150 and 27.3% were middle aged with 150-300, while over 300