1.两年来系統調查的結果都说明了辽宁省东部山区玉米螟一年发生一代,部分进入二代。根据几年来測报資料及两年系統观察的結果,各虫态出現时期为:越冬幼虫5月下旬化蛹,6月上旬出現成虫并产卵,7月下旬一代幼虫化蛹,8月上旬羽化并产卵,以幼虫状态越冬。各虫态出現的时期早晚主要受溫度的影响。 1. The results of the systematic investigation over the past two years show that the corn borer occurred in the mountainous region of eastern Liaoning Province one generation a year and partly into the second generation. According to the data obtained from surveys over the past few years and the results of two-year systematic observation, the stages of emergence of the respective insect states are as follows: Overwintering pups pupate in late May, adults in early June and lay eggs, and the larvae pupate in late July and emerge in early August And spawning, the larval state of winter. The emergence of the various states early and late mainly affected by temperature.