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什么是天敌,天敌是指对被捕食或被寄生的寄主(昆虫或动物)而言。天敌昆虫分为捕食性及寄生性两种,凡是食虫的叫捕食性天敌昆虫,被食的昆虫叫寄主。一种寄主能有一种、两种或更多的天敌。相对来说一种天敌能有一种或几种寄主。天敌昆虫在自然界和它们的寄主之间常常保持着相互制约的辩证关系。呼市地区于1972—1973年进行了林木病虫害普查工作,为害树木的病虫害一百多种,但
What is a natural enemy, natural enemies for the predator or parasitic host (insects or animals) is concerned. Predatory insects are divided into predatory and parasitic two kinds, all insectivorous insects called predatory insects, food insects called host. A host can have one, two or more natural enemies. In contrast, a natural enemy can have one or more hosts. Natural enemies often maintain a dialectic of mutual restraint between nature and their hosts. In Hohhot, the general survey of forest diseases and insect pests was carried out in 1972-1973, which harmed more than 100 kinds of pests and diseases of trees