过去一般认为,害虫必有害。防治病虫害的工作由来已久。到本世纪五十年代初,国内明确提出“治早、治小、治了”,“把害虫消灭在大田之外和为害之初”。随后提出“土洋结合,彻底消灭病虫害”,大搞“有虫必治”、“重点消灭”。当化学防治的副作用日益突出时,提倡生物防治 The past is generally believed that pests will be harmful. Prevention and control of pests and diseases for a long time. By the early 1950s, China clearly put forward the idea of ​​“cure early, cure small and rule off” and “eliminate the pests outside the fields and the beginning of harm.” Then put forward the “combination of earth and ocean, complete elimination of pests and diseases”, vigorously “bug must rule”, “focus on the elimination.” When the side effects of chemical control are becoming more prominent, biological control is advocated