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为害农、林、果、蔬菜的害虫种类繁多,而真正成灾的害虫,只占害虫总种数的1～3%,其余95%以上的害虫,因受天敌等因子的控制,虫口密度很低。在害虫的天敌中种类最多、作用最大的要算是寄生蜂,其中主要的是姬蜂、小蜂及细蜂各总科的成员。由于这些寄生蜂的体型大都很小,生活隐蔽,成虫在夜里又多无趋光性,因而采集比较困难。现将我们近几年来采集这些寄生蜂标本的方法介绍于下,以供参考。一、由害状找害虫,由害虫找寄生蜂,逐步深入地采集。首先可到害虫大发生的地方去采。由于害虫的群体大,目标显著,因而容易发现被寄生的现象。将被寄生的卵、幼虫或蛹带回饲养,便可获得很多宝贵的标本。在虫口密度不大的地方,要从害状上找害虫,再在害
Pests that harm pests, forests, fruits and vegetables are numerous. The truly pests, which account for only 1-3% of the total number of pests, and the remaining 95% or more pests are controlled by natural enemies and other factors. low. Among the natural enemies of pests, the largest species and the most influential ones are parasitic wasps, of which the main ones are Myzus, the small bee and the fine bees. As the size of these parasitoids is mostly small, hidden life, adults in the night and more no phototropism, so the collection is more difficult. Now we in recent years to collect these parasitic specimens of parasites introduced below, for reference. First, look for pests by the vermict of pests to find parasitic wasps, gradually and in-depth collection. First of all, pests can go to the place where mining took place. Due to the large population of pests and their pronounced goals, parasitic phenomena can easily be found. Will be parasitic eggs, larvae or pupae back feeding, you can get a lot of valuable specimens. Insect density in the mouth where not to look for pests from the pests, then harm