棉铃虫幼虫在广西是高粱穗期最严重的害虫,大发生时几乎把高粱籽粒吃光,造成严重失收。 1972年5、6月份我校栽培的高粱结穗时发生大量棉铃虫幼虫为害。我们汲取外地防治经验,用有机磷和有机氯杀虫剂按常用浓度混合喷杀。但由于杂交高粱穗型紧密,棉铃虫幼虫躲在穗内食害籽粒,药液难于喷入穗内;加以高粱抗药性弱,故不仅防治效果差,反而造成严重药害,致使早造高粱严重失收。9月份晚造高粱部分结穗时,此虫又开始大量发生。我们遵照 Cotton bollworm larvae are the most serious pests in the spike stage of sorghum in Guangxi, where they almost eaten up the sorghum grain and cause serious losses. In May and June 1972, a large number of cotton bollworm larvae were harmed in the ear of sorghum cultivated in our university. We learn from the experience of prevention and treatment in the field, with organic phosphorus and organochlorine pesticides at a common concentration of mixed spray kill. However, due to the close hybrid spike sorghum, cotton bollworm larvae hides in the ear to eat grain, the liquid is difficult to spray spike; to sorghum resistance is weak, so not only the control effect is poor, but cause serious injury, resulting in a serious loss of early sorghum Close When the sowing of the sorghum in late September ended, the worm started to massively occur. We follow