在过去的十多年中,浙江省安吉县龙山林场连续应用松毛虫赤眼蜂防治马尾松毛虫(以下简称赤眼蜂、松毛虫),放蜂量每亩高达20万头以上,寄生率虽在80％～90％以上,但松毛虫还是经常发生,因而对赤眼蜂的治虫效果产生了怀疑。为此作者进行了调查和试验,探索提高赤眼蜂防治松毛虫效果的途径。本文着重报道放蜂量及放蜂效果,并对某些有关问题加 In the past ten years, Longshan Forest Farm, Anji County, Zhejiang Province, the continuous application of Trichogramma dendrolimi control Dendrolimus punctatus (hereinafter referred to as Trichogramma, Dendrolimus), the bee amount of up to 200,000 per mu or more, although the parasitism rate In more than 80% to 90%, but the pine caterpillars often occur, and thus Trichogramma pest control effect has cast doubt. To this end the author conducted a survey and test to explore ways to improve Trichogramma trichogramma effect. This article focuses on the amount of bee and put the bee effect, and some of the related issues plus