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通过实地考察,明确了草地螟在呼盟各地越冬问题。一般年份没有越冬幼虫,只有二代幼虫发生为害的年份(如:1982年)才有越冬幼虫,并成为翌年虫源之一。但主要虫源由异地迁飞而来。考察中初步掌握了越冬幼虫的分布情况。越冬幼虫的调查,应在二代幼虫发生危害的年份和地块进行,改变过去盲目调查的做法。
Through on-the-spot investigation, it is clear that Grasshopper has overwintered in the area of Hohhot. In general years there is no overwintering larvae, only the second generation larvae harmful years (such as: 1982) have overwintering larvae, and become one of the following year’s insects. But the main source of insects migrated from different places. The investigation initially mastered the distribution of overwintering larvae. The investigation of overwintering larvae should be carried out in the years and plots where the second-generation larvae have been harmed, changing the practice of blind investigation in the past.