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前言在自然界天敌昆虫种类繁多,资源丰富。如何利用天敌昆虫防治林木害虫,已成为生物防治害虫的主要组成部分和重要途径之一。长期以来,林木害虫主要以化学农药进行防治,不但污染了环境、土壤、水源、危及人类健康,而且使很多害虫产生了抗药性,防治效果逐年下降,药剂的使用浓度逐年增加,从而杀伤了大量天敌,使原来为害轻的害虫迅速猖獗成灾,破坏了生态平衡,影
Preface Natural enemies in nature, a wide range of resources and rich. How to use natural enemy insects to control forest pests has become a major component of biological control pests and one of the important ways. For a long time, pests of trees have been mainly controlled by chemical pesticides, which not only pollute the environment, soil and water and endanger human health, but also make many pests produce drug resistance. The control effect declines year by year. The use concentration of medicament increases year by year, Natural enemies, so that the original pest damage to the rapid rampant disaster, undermining the ecological balance, shadow