灰拟花尺蛾幼虫空间分布的研究

Study on the Spatial Distribution of Larerannis or thogrammaria lavae

通过对桦树林抽样调查与几种聚集度指标检验法相结合，说明花尺蛾幼虫空间分布型为聚集分布，分布的基本成分是个体群。聚集强度随种群密度的升高而增加，用1wa 0的方法，确定了不同虫口密度下的理论抽样数及序贯抽样检索表．为防治提供了理论依据。

Sampling investigation on Birch stand plus indicators for cluster intensity were applied to illustrate the spatial distribution of Larerannis orthogrammaria lavae. The distribution appeared a individual population. Cluster intensity increases with the population density. Sampling number under different insect population densities as well as sequential sampling indices was determined theoretically by means of 1 wao.