棉花封行后,因果枝交错,喷药时果枝受机械损伤较重,喷药亦难均匀,同时,由于红铃虫幼虫孵化后,迅速蛀入青铃,更增加了防治上的困难,一般年份皮棉损失仍达5—10%.为了改进施药方法,提高防治效果,我们将防治森林害虫的烟雾剂引用于棉田,用“741”烟雾剂和自制的土烟剂,先后在如皋城西、邓元、丁北、新民等公社进行了棉花蕾铃期害虫的大田防治试验,获得了初步成果,并摸索到一些棉田放烟的规律.一、烟雾剂防治棉花蕾铃期害虫的大田试验结果 After the cotton seal line, due to staggered branches, when sprayed fruiting branches by the mechanical damage heavier, spraying is also difficult to uniform, at the same time, because the pink bollworm larvae hatch quickly into the green bell, but also increased the difficulty of prevention and control, the general Year lint loss is still up to 5-10% .In order to improve the application method, improve the control effect, we will control the forest insect pests quoted in the cotton field, with “741” aerosol smoke and self-made tobacco, has Rugao in the west, Deng Yuan, Ding Bei, Xin Min and other communes carried out field trials on cotton boll-age pests and gained preliminary results, and found some laws of smoke release in cotton fields.