油松毛虫越冬幼虫垂直分布的调查

A Study on the Dendrolimus tabulaeformis Overwintering Larvae's Vertical Distribution

通过4块标准地与30株标准木的伐木调查,表明:油松毛虫越冬幼虫以在地面分布为主,其虫口数约为树干上分布的3倍;在树干1.5m以上的分布占越冬幼虫的2.2％。从而为早春防治越冬幼虫的上树,所采取的各种阻隔防治方法,提供了可靠数据。

This paper is concerned with the overwintering pine larvaes vertical distribution according to the data of 4 sample sites and 30 standard trees. The results are summarized as following, most larvae pass through winter on the ground which is about 3 times greater than those on the tree's stock. The number of larvae on the stock over 1.5m is about 2.2% of all the total overwintering larvaes. This provides reliable data for taking various control measures to prevent overwintering larvae from climbing up trees in the early spring.