松毛虫是我省马尾松林的主要害虫。据普查统计,分布于66个县、市、区,为害面积达143万亩,是历年防治的重点对象。现行防治指标和确定发生程度均以幼虫数量为依据,但松毛虫幼虫在林间的分布,常因环境条件和林分状况不同而异,采用常规的调查方法,往往使所得结果与实际情况不符,从而影响预测预报和防治工作。为了确切地掌握松毛虫的发生 Dendrolimus is the main pest of Pinus massoniana forest in our province. According to the census statistics, distributed in 66 counties, cities and districts, the damage area amounts to 1430000 mus, is the focus of control over the years. The current control index and the determination of occurrence are based on the number of larvae. However, the distribution of pine caterpillar larvae in the forest often varies according to the environmental conditions and the stand status. The conventional investigation methods often make the results inconsistent with the actual situation , Thus affecting the prediction and prevention and control work. In order to accurately grasp the occurrence of pine caterpillars