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调查研究在辣椒疫霉病发生严重的乌鲁木齐市安宁渠区进行，共查１８块田。通过聚集度指标Ｃ，Ｉ，Ｋ，ＣＡ，Ｉδ，ｍ，ｍ／ｘ等项计算，并用频次法进行测定，结果绝大多数田块属于聚集分布。根据Ｔａｙｌｏｒ的Ｓ２ｘ幂回归方程和徐汝梅改进Ｉｗａｏ的ｍｘ二次回归方程计算，结果分别为Ｓ２＝２０２７７ｘ１３２３４和ｍ＝－０４９９５＋４０９３４ｘ－０７７１３ｘ２，进一步说明辣椒疫霉病病株属于聚集分布。当发病株率达２６５４％时，平均拥挤度ｍ达最高值。
Investigation and research was carried out in Anning District, Urumqi, where Phytophthora capsici was serious. A total of 18 fields were investigated. Through the aggregation index C, I, K, CA, Iδ, m, m / x and other terms calculated and frequency method was used to determine the results of the vast majority of plots belong to the aggregation distribution. According to Taylor’s S2 regression equation and Xu Rumei improvement Iwao m * χ quadratic regression equation, the results were S2 = 2 0277x1 3234 and m * = -0.4995 +4 0934x-0 7713x2, and further Phytophthora capsici disease belongs to the aggregation distribution. When the incidence of strains reached 2654%, the average crowding degree m * reached the highest value.