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用化学药剂防治病虫害,有见效快,受地区性、季节性影响小等优点,但目前推广使用的多为非选择性农药,既杀死了害虫,也大量杀伤了天敌,破坏了生态平衡,降低了克制害虫自然因素的作用,致使害虫一再猖獗.据报导,昆虫中有28%种类是捕食其它昆虫的,又有24%的种类是其它昆虫体外或体内寄生物.很早以前就有人估计,在植食性昆虫中,98%以上是在各种自然天敌控制之下,不为人们注意,而只有不到2%的植食性昆虫是有害的.这说明天敌对害虫的自然控制作用是不能忽视的.因此,如何合理
The use of chemical agents to control pests and diseases is effective, affected by the regional, the seasonal impact of small advantages, but the current promotion of the use of mostly non-selective pesticides, both kill pests, but also a large number of natural enemies, destroying the ecological balance, Reduced the role of natural restraint pests, causing pests repeatedly rampant.It is reported that 28% of the species of insects prey on other insects, and another 24% of species of other insects in vitro or in vivo parasites. Someone long ago it was estimated More than 98% of the herbivorous insects are under the control of various natural enemies and are unnoticed, whereas less than 2% of herbivorous insects are harmful, indicating that the natural control of natural enemies on pests can not Neglected. So how reasonable