A Study on the Spatial Pattern of Spider Mite:Oligonychus urama

By spot check in Phyllostachys heterocycla cv.pubescens forest in Nanping Fujian in 1997,the research results showed that Egg's of Oligonychus urama spatial patterns of each stage were all of aggregation distribution except of poisson distribution in the first and second ten days of April,which presented the regularity of mid-degree aggregation→poisson distribution→high-degree aggregation→low-degree aggregation→mid-degree aggregation.Active mites'spatial patterns were also all of aggregation distribution except of poisson distribution in the last ten days of April,which presented the regularity of mid-degree aggregation→poisson distribution→low-degree aggregation→mid-degree aggregation.The correlative analysis indicated that the effect sequence of climate and predatory mites on eggs aggregation degree was air temperature.>relative humidity>predatory mites>rainfall,and on the active mites,the sequence was air temperature>predatory mites>predatory mites>relative humidity>rainfall.