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据文献记载，在北纬32～40。的黄河流域棉区棉铃虫HeliocoverpaarmigeraHubner年发生4代，常年第二代为主害代。而1994年，第五代棉铃虫在河南省大发生，这在我省历史上是罕见的。现将室内饲养和田间发生情况报道如下。1室内饲养结果1．1五代幼虫化蛹、越冬1．1．1郑州郊区于19
According to the literature, at 32-40 north latitude. The cotton bollworm Heliocoverpaarmigera Hubner in the Yellow River cotton area occurred 4 generations annually, the second generation perennial victims. In 1994, the fifth generation of cotton bollworm occurred in Henan Province, which is rare in the history of our province. Indoor feeding and field occurrence are reported below. 1 Indoor feeding results 1.1 Five generations of larvae pupa, winter 1.1.1 Zhengzhou suburbs in 19