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我省两种重要的森林害虫——马尾松毛虫、大袋蛾发生面积大,危害程度重,对林业生产威胁很大。几年来,在调查和防治一些森林害虫的过程中,经常发现寄蝇在很多林木害虫体上寄生,而且寄生率高,大大压低了害虫虫口密度,使这些害虫不能大发生。就松毛虫而言,寄生蜂、鸟类和寄蝇对它起了很大的抑制作用。我们在省内林区多次调查,查明了寄蝇对森林害虫寄生的良好效果,现将调查结果报道于后。
In our province, two important forest pests - Dendrolimus punctatus and big-bagged moths have large area and heavy damage, threatening forestry production. In recent years, in the course of investigating and controlling some forest pests, it is often found that fly flies parasitize many forest pests and their parasitism rates are greatly reduced. Pest population densities are greatly reduced so that these pests can not occur. In the case of pine caterpillars, parasitic wasps, birds and flies have a great effect on it. We have conducted many surveys in the forest area of the province to find out the good effect of flies on the parasitic effects of forest pests. The findings are reported later.