沿江棉区由于常年4、5月份春雨较多，6月中旬初～7月中旬初为霉雨季节，雨日、雨量大，蛹和初孵幼虫死亡率高，1、2、3代棉铃虫常发生较轻，如霉雨量少，则三代具备一定发生基数。4代为沿江棉区主害代，5代集中于后期长势旺盛的中、晚熟棉田危害。根据沿江棉区棉铃虫危害特点和 The cotton growing season in April and May in spring along the Yangtze River is more with spring rainy season from April to mid-July to early July. The rainy days and rainy days are the highest, and the mortality of pupae and newly hatched larvae is high. Often occur lighter, such as mold rainfall less, then the three generations have a certain base. 4 behalf of the main generation of cotton along the Yangtze River, 5th generation concentrated in the late strong growth of mid-and late-maturity cotton fields. According to the cotton bollworm along the Jiangmian Hazard characteristics and