杨毒蛾抽样调查技术的研究

Studies on the Sampling Technique of Willow Moth

杨毒蛾(Leucoma candida Staudinger)是吉林省西部防护林杨树的主要害虫之一,先后在白城、洮南和镇赉等市(县)成灾。在杨毒娥的综合治理中,已有了该虫的危害指标及一套行之有效的防治方法,但由于没有统一、可行的杨毒蛾抽样调查方法,限制了管理水平进一步提高,本项研究就是针对这一突出问题而进行的。 本文对杨毒娥幼虫进行了简单随机抽样、系统抽样、分层抽样和整群抽样以及序贯抽样的研究、比较,提出了杨毒蛾估值抽样和风险决策抽样的方法、公式及抽样数。

This paper deals with two categories of sampling of willow moth, Leucama Candida: (1) the parameter estimation samplings and (2) the decision-making samplings. There are four sampling methods, that is, simple random sampling, stratified sampling, systematic sampling and cluster sampling to be experimented in the parameter estimation. It is suggested that the cluster sampling is a better technique for the estimation of willow moth larvae among the 4 estimation samplings. The decision-making sampling may be carried out by sequential sampling. A mathematical model of sampling is given asT'(n) = 7.916 6nX1.4913±16.898 9X0.745 7 n + 0.581 7X1.4913