麦茎蜂cephus pygmaeus(L.)为害小麦形成籽粒瘦秕,造成减产。80年代以来,随着耕作制度的改变和生态环境条件的变化,为害逐年加重。据调查,平均被害株率:1983年为12％、1984年18.4％、1985年29.2％;千粒重平均下降31.3％。 该虫在河南省每年发生1代。3月底4月 Wheat stem bee cephus pygmaeus (L.) Harms the formation of wheat thin grains, resulting in reduced production. Since the 1980s, with the change of farming system and changes of ecological environment conditions, the harm has increased year by year. According to the survey, the average victim plant strain rate was 12% in 1983, 18.4% in 1984 and 29.2% in 1985; the average grain weight per kilogram dropped by 31.3%. The worm occurs in Henan Province, one generation per year. March the end of April