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黑青小蜂Dibrachys cavus Walk(=I). boucheanus Ratz.)分布世界各地的一种寄主很多的金小蜂(Pteromalidae)。1955年湖北省农业科学研究所在棉花仓库中发现其对越冬红铃虫有很高的寄生率,并进一步证明,该蜂消灭红铃虫效果极大,在仓库中释放后其寄生率达90％以上,在其释放区棉田的虫花率降低至1.4％,而对照区棉田则为13-23％。现在湖北等省均大量繁殖,作为消灭越冬红铃虫的一种重要措施。上海近年也进行大量繁殖及放饲。根据国外文献记载,黑青小蜂的寄主甚多,Faure & Zolstorewsky(1925)列举有:鞘翅目2种,双翅目1种,膜翅目27种,鳞翅目14种;Gontarski(1939)进一步调查,列举其寄
Dibrachys cavus Walk (= I). Boucheanus Ratz.) A large host of Pteromalidae species distributed throughout the world. In 1955, Hubei Academy of Agricultural Sciences found that it had a high parasitic rate of overwintering red bollworm in the cotton warehouse, and further proved that the bee had a great effect in eliminating pink bollworm and had a parasitic rate of 90 % Or more, the pest blossom rate in the cotton field in its releasing area was reduced to 1.4%, while that in the control area was 13-23%. Hubei and other provinces are now a large number of breeding, as an important measure to eliminate overwintering red bollworm. In recent years, Shanghai has also carried out large-scale breeding and feeding. According to foreign literature, there are many hosts of black bee, Faure & Zolstorewsky (1925) lists: two kinds of Coleoptera, one species Diptera, Hymenoptera 27 species, Lepidoptera 14 species; Gontarski (1939) Further investigation, list its send