广西沙塘林场马尾松毛虫越冬代幼虫空间分布型

Spatial Distribution Pattern of Overwintering Dendrlimus punctatus Larva in Shatang Forest Farm of Guangxi

于2009年1月采用棋盘式抽样方法,调查广西沙塘林场马尾松毛虫(DendrolimuspunctatusWalker.)越冬代幼虫虫口密度,采用分布型指数及回归模型法探讨马尾松毛虫越冬代幼虫空间分布型。结果表明,广西沙塘林场马尾松毛虫越冬代幼虫的空间分布型呈聚集型分布,分布的基本成分为个体群;马尾松毛虫越冬实际累积虫数为1190条,低于拒绝限下界(1347),说明不需要进行松林全面防治。

In January 2009,the population spatial pattern of overwintering Dendrolimus punctatus larva was analyzed,using the indices of distribution and regressive models with checkerboard sampling,based on the data of mean population density of the larva in Shatang Forest-farm of Guangxi.The results showed that in this forest-farm the spatial pattern of overwintering D.punctatus larva exhibited an aggregation pattern,with individual colony as its component.The actual cumulative number of Worm-like investigation was 1190,lower than the rejection lower bound（1347）,indicating that pine trees do not need full control.