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我国农作物病虫害生物防治面积1981年达到1.3亿多亩,比1980年增加近3,000万亩。其中,以虫治虫的面积(包括自然保护)约占一半,其余是以菌治虫和以菌治病。我国农业采用生物防治病虫害,收到了保持生态平衡,除害增产,降低生产成本的效果。瓢虫、草蛉、蜘蛛等是棉花前期棉蚜的天敌,我国南北棉区已普遍用这些天敌来防治棉蚜。据湖北省六个县49个大队315个生产队的调查,1980年每亩农药费用仅2.66
The area of biological control of crop pests and diseases in our country reached 130 million mu in 1981, an increase of nearly 30 million mu more than in 1980. Among them, the pest control area (including nature protection) accounts for about half of the rest is to cure bacteria and bacteria bacteria. China’s agriculture uses biological control of pests and diseases and has received the effect of maintaining ecological balance, removing pests and increasing production, and lowering production costs. Ladybugs, weeds, spiders and other cotton aphids early cotton aphids natural enemies of cotton in our country has been widely used in these areas to control cotton aphids. According to a survey of 315 production teams of 49 brigades in six counties in Hubei Province, the cost of pesticides per mu in 1980 was only 2.66