朝阳县十二台公社1978年种植棉花一万亩,其中有1280亩棉花常年没有打药,利用自然天敌控制蚜害,棉花长势良好。1978年6-7月我们到十二台公社进行了调查,报告如下。一、十二台公社1975年在南大营子三队有30亩棉花利用了自然天敌防治蚜虫,棉田没有受害。1976年南大营子五队有100亩棉花没有打药,棉花已经卷叶,瓢虫把蚜虫吃光后叶片又展开了。到1977年该社棉蚜生防面积发展到 Chaoyang County, 12 communes In 1978, planting 10,000 hectares of cotton, of which 1280 acres of cotton perennial no fight drugs, the use of natural enemies control aphid damage, cotton grows well. From June to July 1978, we conducted a survey to twelve communes and the report is as follows. First, the twelve communes in 1975 in the South Camp three sub-teams of 30 acres of cotton use of natural enemies to control aphids, cotton fields did not suffer. In 1976, there were 100 mu of cotton in the Nantou sub-team, but the cotton had been curled up. The ladybug eaten the aphids and the leaves began to unfold again. By 1977 the cotton aphid biocontrol area developed to