通过田间系统调查和资料计算,采用6种聚集指标和Iwao,Taylor法测定,结果表明,辣椒疫病株在田间以个体群呈聚集分布,个体群内部的分布是随机的,空间分布型属负二项分布。明确了构成聚集的原因,既包括病菌本身的特性,也包含着它对环境条件差异的反应结果。通过对五种抽样方法的比较,认为田间调查时,采用对角线取样方法为好,省时,省力,误差较小,其抽样数量由田间发病程度决定,发病越轻,抽样量越大。 Through the field investigation and data calculation, six kinds of aggregation indexes and Iwao and Taylor method were used for the determination. The results showed that the capsicum were clustered in individual groups in the field, the distribution inside the individuals was random and the spatial distribution was negative Item distribution. Clarified the reasons for the aggregation, including both the characteristics of the bacteria itself, as well as its response to the differences in environmental conditions. Through the comparison of the five sampling methods, it is considered that the diagonal sampling method is better in field investigation, which saves time, effort and error. The sampling quantity is decided by the degree of field incidence. The incidence is lighter and the sampling amount is larger.