河南省虞城县张集公社张庄大队是盐碱地多,耕作粗放的产棉队,棉花产量长期徘徊在亩产皮棉60—70斤的水平上。自1973年以来大搞科学种田,亩产皮棉突破了百斤。1974年采用了以生防为主的综合防治措施,即前期田间放瓢虫、中期放草青蛉、后期放蚂峰和癞蛤蟆,取得了良好的效果。1975年用农药的投 Zhang Yucheng County, Henan Province, set Zhang commune Zhang Zhuang Brigade is more than saline, extensive farming cotton production team, long-term cotton production hovering at the level of 60-70 pounds of mu of lint. Since 1973, large-scale scientific farming, lint per mu exceeded a hundred jins. In 1974 adopted a comprehensive prevention and treatment measures to biological control, that is, the field put ladybugs in the early, medium-term grassland grasses, later put the peak and toad, and achieved good results. In 1975 the vote with pesticides