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一、以虫治虫目前,国内外均以利用寄生性昆虫和捕食性昆虫为主,大量繁殖和释放灭虫率高的天敌,并不断挑选和培养良种天敌。多为采取国内区域移植的办法,但也有一些国家采用从国外引进天敌的措施。如美国引进了防治77种害虫的485种天敌,其中成功的有95种,能治22种害虫;加拿大引进天敌104种(寄生性昆虫89种,捕食性昆虫15种),其中能有效防治害虫的有36种(24种食叶害虫,4种阔叶树蛀虫,4种枝梢球果害虫,4种蚧壳虫)。据意大
First, worm pest At present, both at home and abroad to the use of parasitic insects and predatory insects, a large number of natural enemies of high rate of release and release of pests, and continue to select and cultivate seed predators. Mostly adopt the method of domestic regional transplantation, but some countries also adopt the measures of introducing natural enemies from abroad. For example, the United States introduced 485 kinds of natural enemies to prevent and control 77 kinds of pests, of which 95 species were successful and capable of treating 22 kinds of pests. Canada introduced 104 kinds of natural enemies (89 kinds of parasitic insects and 15 kinds of predatory insects) There are 36 species (24 leaf-feeding pests, 4 broad-leaved tree borers, 4 kinds of shoot cone pests, 4 scale insects). According to Italy