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自然界是一个有机的整体,农田里的作物和为害它们的害虫以及这些害虫的天敌都是这个有机体的成员。害虫和它的天敌有单食性,也有多食性,它们之间互相依赖,互相制约,在农田里形成了错综复杂的关系,这就是一般所说的食物锁链。例如棉蚜是棉花的主要害虫之一,蚜茧蜂是棉蚜的天敌,而一种金小蜂和一种缨蜂又是蚜茧蜂的天敌,这样一个像链锁一样一环扣一环就是一个简单的食物锁链。利用有益昆虫防治农业害虫,也正是在充分掌握彼此间微妙的关系后,人为地加强对害虫不利的方面,充分发挥天敌的作用,从而达到消灭害虫的目的。一般说
Nature is an organic whole. The crops in the fields and the pests that kill them, as well as the natural enemies of these pests, are members of this organism. Pests and their natural enemies have simplex and multi-diet, they depend on each other and restrict each other in the farmland has formed a complex relationship, which is generally referred to as food chain. For example, cotton aphid is one of the main pests of cotton, aphid Braconidae is the natural enemies of cotton aphid, and a golden bee and a Crane Bee is also aphid Braconidae natural enemies, such a chain like a snap It is a simple food chain. The use of beneficial insects to control agricultural pests, it is also in the full grasp of the delicate relationship between each other, the artificially enhance the adverse aspects of pests, give full play to the role of natural enemies, so as to achieve the purpose of eliminating pests. Generally speaking