在农作物的生长过程中,常常会遭到多种害虫的危害,而在害虫发生为害的同时,田间还存在着大量的各种天敌,帮助人们消灭害虫,起到很大的自然抑制作用,但是,在过去的害虫防治中,特别是采用化学农药防治中,就很少考虑害虫天敌的自然抑制作用,往往是“一刀切”、“一律化”、全田施药的用药方法,由于这种不合理的使用农药,就“敌”、“友”不分,害虫、益虫同归于尽,因而造成害虫天敌显著下降,而导致某些害虫猖獗成 In the process of crop growth, many pests are often endangered. In the meantime, there are a large number of natural enemies in the field, which help people to eliminate pests and play a great role in natural inhibition. However, In the past, pest control, especially the use of chemical pesticides in the prevention and control, rarely consider the natural inhibition of pest natural enemies, often “across the board,” “all”, the whole field of drug application method, because this is not Reasonable use of pesticides, “enemies”, “friends” regardless, pests, beneficial insects go hand in hand, resulting in a significant decline in natural enemies of pests, which led to the rampant of some pests into