Put simply, farmers see that beneficial insects often devour pests, and when this is happening, pesticide is not needed.

 
  • 簡(jiǎn)單地說(shuō),農民們看到益蟲(chóng)往往會(huì )將害蟲(chóng)吃掉,如果發(fā)生這種情況,農藥便成為多余的。
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