Studies on bionomics and occurrence regulation of Phigalia djakonovi Moltrecht

Investigation and observation were made on bionomics and occurrence regulation of Phigalia djakonovi Moltrecht, which is a major pest of white birch, in Daxing’an Mountain forest area of lnner Mongolia during 1997 to 1999. The pest has one generation per year and overwinters as pupae in the soil in this area.Development, bionomics and outbreak of the pest are closely related with the food and environment conditions.

内蒙古大兴安岭林区白桦的三种叶部害虫

白桦尺蠖、中带齿舟蛾和梦尼夜蛾是内蒙古大兴安岭林区白桦 3种最重要的叶部害虫 ,近年来在绰源林业局林区猖獗成灾 ,并造成了严重的损失。为了有效地防治这 3种害虫 ,经调查分析 ,本文报道了上述 3种白桦害虫的分布、寄主、危害情况。