利用七星瓢虫防治棉蚜,是一种经济有效、安全易行的生物防治法。我区在三年小型试验示范的基础上,一九七三年利用瓢虫治蚜面积达到14.7万余亩;一九七四年在批林批孔运动的推动下,全区利用瓢虫治蚜面积增加到74万亩,效果都很显著。广大贫下中农称赞说:“瓢虫治蚜就是好,省工省钱效 The use of ladybird ladybug control cotton aphid, is a cost-effective, safe and easy biological control method. On the basis of three years of small-scale pilot demonstration in our district, the area of ​​aphids treated with ladybugs reached more than 147,000 acres in 1973. Driven by the campaign to bless the hole and boulder in 1974, Aphid area increased to 74 million mu, the effect is significant. The majority of poor and middle peasants praised: "ladybugs cure aphids is good, save money and work efficiently