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可以说,自从有了农业生产以来,人类就不断同各种害虫作斗争。这场仗巳经打了好几千年,不但现在没有结束,将来还要继续下去。在这个斗争中,人们不光是依靠捕捉,还发明了种种化学毒剂,甚至利用以昆虫攻击昆虫、散布致病的微生物等方法来对付这些人类的天敌。一次成功的试验这些方法的确很有用,曾帮助人们保住了不少庄稼。不过在以前的许多方法中,没有一种能使广大地区的某种害虫灭绝。在害虫多的
It can be said that since the agricultural production began, humans have been constantly fighting various kinds of pests. This chanting has been going on for thousands of years. Not only is it not over yet, it will continue in the future. In this struggle, people not only rely on capture, but also invent all kinds of chemical poisons, and even use natural insects to attack insects, spreading pathogenic microorganisms to deal with these natural enemies. A successful test of these methods is indeed very useful and has helped people keep a lot of crops. However, none of the many previous methods allowed the extermination of certain pests in a wide area. In many pests