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据苏修《植物保护》杂志1970年第7期报导,由于化学药剂药害的扩展,美帝近年来更多地注意生物防治的研究和应用。1955年,有66％的昆虫学家研究杀虫剂,1967年下降到21％;同期內研究生物防治的人数则由17％上升到42％。除了利用天敌防治害虫外,近来着重研究和应用以下方法。 (一)绝育法
According to Soviet revisionism “Plant Protection” magazine in 1970 No. 7 reported that due to the expansion of phytotoxicity, the United States and the emperor in recent years pay more attention to biological control research and application. In 1955, 66% of entomologists studied insecticides, dropping to 21% in 1967; the number of people studying biological control increased from 17% to 42% in the same period. In addition to the use of natural enemies to control pests, the recent focus of research and application of the following methods. (A) sterilization law