松毛虫是落叶松的大害虫,多年来采取了各种防治措施,对其猖獗危害起到了一定的控制作用。为了寻找一种简便易行,经济有效,适于深山缺水地区作业,对人畜较安全,杀伤天敌少,污染环境轻,残效期较长的防治方法,我们在友好林业局朝阳经营所进行了拟除虫菊脂毒笔防治落叶松毛虫的试验,收到了较好的效果,现将试验结果简述如下: 一、室内试验为给林间大面积防治试验提供代据,首先对越冬前后的松毛虫幼虫进行了室内药效试验。试验所用幼虫均由林内采回。(一)试验方法:在纤维板上摸拟树干直径分别划内径10cm、15cm、20cm,宽 Dendrolimus larvae is a large pest, over the years to take a variety of control measures, its rampant harm played a certain role in the control. In order to find a simple and economical, effective, suitable for mountainous and water-poor areas of operation, safer to human and livestock, fewer natural enemies, polluting the environment light, longer effective period of the control methods, we were Chaoyang Management Office of the Ministry of Forestry To pyrethrum poison pen prevention of Dendrolimus caterpillar, the experiment has received good results, the test results are summarized as follows: First, the indoor test to provide evidence for large-scale prevention and control of forest, first of all overwintering pine caterpillars Larvae conducted indoor efficacy test. The larvae used in the experiment were recovered from the forest. (A) test method: simulated trunk diameter on the fiberboard were drawn within the diameter 10cm, 15cm, 20cm, width