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研究害虫的空间分布信息,对於确定相应的抽样技术以及提高测报水平与防治质量都有重要的意义。1983、1984两年我们在象山县早、晚稻田上对各代稻纵卷叶螟幼虫作了有关的调查。采用Iwao、Taylor及其它5种聚集度指数的方法,测定了稻纵卷叶螟幼虫的空间分布型并检验了序贯抽样技术。调查方法:以每丛稻为一样本,逐一记载幼虫数,1983年共查19块田,每块田查1000丛;1984年共查42块田,每块田查200丛。将所得资料,以每块田为一组
Studying the spatial distribution information of pests is of great significance for determining the corresponding sampling techniques and improving the level of reporting and the quality of prevention and treatment. 1983, 1984 two years we Xiangshan early and late rice fields on all generations of rice borer larvae were investigated. Using Iwao, Taylor and other five kinds of clustering index method, the spatial distribution of C. medinalis larvae was determined and the sequential sampling technique was tested. Survey method: Each cluster of rice as a sample of the number of larvae were recorded one by one in 1983, a total of 19 check the field, each field check 1000; 1984 a total of 42 fields, each field check 200 plexus. The information obtained, in a field for each group