一、引言666药剂对松毛虫(Dendrolimus punctatus Wk)幼虫的毒效很高,在幼虫2—3龄期间,喷洒可湿性666药剂1:500悬液,可以得到良好的防治效果。但由于我国林区大多在山地,缺乏水源,道路难行,喷雾器械携带不便,工作效率低,加之在树木高大的林地里,地面喷雾防治松毛虫尚存在一定的困难。因此,目前须要寻找一种适于我国林区 I. INTRODUCTION The 666 pesticide has a high toxicity to Dendrolimus punctatus Wk larvae. During the 2-3 years of larval spraying, the 1: 500 suspension of wettable 666 agent can be sprayed with good control effects. However, due to the fact that most forest areas in China are in mountainous areas, lack of water sources, difficult roads, inconvenient spraying equipment and low efficiency, combined with high forest trees, it is still difficult to prevent and control pine caterpillars by surface spraying. Therefore, we need to find a suitable forest region in our country