桑粉虱幼虫的空间格局及抽样技术研究

Spatial Distribution of Pealius mori Larvae and Its Sampling Technique

为了对桑粉虱的防治提供参考,对桑园桑粉虱幼虫危害情况进行调查,运用聚集度指标法、Iwao法和Taylord法等对其空间分布型进行测定检验。结果表明:桑粉虱幼虫在任何密度下都呈聚集分布,聚集原因是由环境因素与昆虫本身聚集习性共同引起,分布的基本成分为个体群,个体间相互吸引。根据Iwao的m*-m回归关系,确定幼虫的最适理论抽样公式及序贯抽样公式,建立不同密度下的理论和序贯抽样数表。

The spatial distribution pattern of Pealius mori larvae was investigated by aggregation index,Twao and Taylord methods to analyze the harm condition of P. mori larvae and to provide a reference for control of P. mori. Results： P. mori larvae present an aggregation distribution pattern under any density,which is caused by environmental factors and itself aggregate habits. The basic component of distribution is individual group and the larvae attract mutually among individuals. The theoretical and sequential sampling tables of P. mori larvae under different population density are established by determining the optimum theoretical sampling formula and sequential sampling formula of P.mori larvae according to m＊-m regression relationship of Iwao.