我县在1973年冬自辽宁棉麻研究所引进了两个棉花早熟品种,1974年开始夏播试种。根据改制后的变化情况对棉铃虫在夏播棉田的发生规律进行了系统调查和大面积观察。四年来的实践使我们认识到:棉花由春播变夏播是种植上的革命,是避免二代棉铃虫危害,控制三、四代危害的一条新的有效途径,是综合防治棉铃虫的一个侧面。 My county in the winter of 1973 from the Liaoning Institute of Cotton and Cotton introduced two varieties of cotton, summer planting began in 1974 test. According to the changes after the reform, the occurrence and distribution of cotton bollworm in summer cotton fields were systematically investigated and observed in large area. Four years of practice have made us realize that the cotton sowing from spring to summer sowing is a revolution in planting. It is a new effective way to avoid the harm of the second generation cotton bollworm and to control the harm of the third and fourth generations. It is a new way to comprehensively control the cotton bollworm. .