涿县于1993年秋季首次使用马烟剂对黄羊山森林公园初孵(1—3令)松毛虫幼虫进行防治,效果达98%以上,防效显著。具体作法是:首先进行调查,掌握虫情发展趋势,抓住初孵1—3令幼虫不抗药这一环节。于8月23日到25日,组织由12人组成的放烟突击队。按30×40米排列布置烟点共268个。每点用 Shexian County in the fall of 1993 for the first time the use of hay smoke on Huangyang Mountain Forest Park hatchlings (1-3 orders) Dendrolimus larvae prevention and control, the effect of more than 98%, significant effect. The specific approach is: first of all to investigate and grasp the development trend of insects, catch the first hatchlings larvae do not resist this aspect 1-3. From August 23 to August 25, a 12-person smoke commando was organized. Arranged by 30 × 40 meters smoke point a total of 268. Every point