玉米螟是苏北沿海粮棉间套混作地区玉米和棉花上的重要害虫。为提高成虫发生期预报的精度,作者通过对若干蛹不同发育阶段的特征和历期的观察,将玉米螟蛹的发育划分为六个级别,现报道如下,供参考。 Corn borer is an important pest on maize and cotton in the cotton-mixed intercropping area along the northern Jiangsu coast. In order to improve the accuracy of forecasting the occurrence of adult worms, the author divided the development of the maize borer pupae into six grades by observing the characteristics and the duration of several pupae in different developmental stages, and are reported as follows for reference.