玉米螟是嫩江地区主要粮食作物玉米、高粱、谷子上的主要害虫。在本区自北向南一年发生l～2代。位于齐齐哈尔市郊的嫩江所则是l～2代过渡地带。属于不完全二代区。危害程度及产量损失以第一代为重。发生数量预测预报以第一代为主。 玉米螟发生数量历年有很大的变化。有资料以来严重份百株幼虫数高达652头。轻发生 Corn borer is the main food crops in Nenjiang corn, sorghum, millet on the main pests. In this area from north to south a year l ~ 2 generation. Located in the suburbs of Qiqihar Nen River is the l ~ 2 generation transition zone. Belongs to incomplete second generation district. Degree of harm and loss of production to the first generation. Predict the number of occurrences to the first generation. The number of occurrence of corn borer has changed greatly over the years. Since the data have been seriously part of the number of 100 larvae up to 652 head. Light happen