用拟除虫菊脂毒笔防治松毛虫,简便易行,经济安全,尤其适用于山高树大的林地。以前防治大都在春季进行,近两年来,建平、阜新、彰武等县在秋季防治了近20万亩林地,杀虫率在80％左右,虽略低于春防,但松毛虫越冬死亡率显著提高,可达到75％以上。另外,秋季防虫是在农忙之后,不与农活争劳力;松毛虫秋季下树时间比较集中,防治时间比较好掌握。 With pyrethrum poison pen prevention and control of pine caterpillars, easy, economic security, especially for the tall trees in the woods. In the past two years, nearly 200,000 mu of forest land was dug in Jianping, Fuxin and Zhangwu prefectures in the past two years. The insecticidal rate was about 80%. Although it was slightly lower than that in spring, the caterpillar overwintered and died The rate is significantly increased up to 75%. In addition, pest control in the autumn is busy, do not struggle with the farm work; Dendrolimus autumn time is more concentrated under the control of a better grasp.