兴安落叶松鞘蛾天敌及其作用研究初报

PRELIMINARY STUDIES ON NATURAL ENEMIES AND THEIR FUNCTION OF COLEOPHORA DAHURICA

本文对兴安落叶松鞘蛾的天敌进行了研究，除卵期尚未发现有天敌外，其它虫态共发现天敌３８种。其中寄生蜂１１种，蜘蛛１６种，鸟１１种。寄生蜂对幼虫和蛹的寄生率可达５０％；蜘蛛对幼虫和成虫均有较大的控制作用；鸟类在冬季和春季可大量捕食幼虫，５月份大部分候鸟飞来时，仅１０天内即可降低虫口８０％。

This paper deals with the natural enemies of larch casebearer ( Coleophora dahurica Flkv.) in Jilin province. It was found that there are 38 species of natural enemies (11 species of parasitoids, 16 species of spiders and 11 specie s of hunting birds). The total parasitic rate of the larvae and pupae reached 50% in some years. The spiders could effectively destroy casebearer larvae an d adults. The birds were important predators in winter and spring seasons. L arge number of migratory birds could reduce 80% of larch casebearer population in about 10 days in May. Ways to protect and utilize larch casebearers na tural enemies are also discussed.