中文摘要：

辣椒白粉病是由辣椒拟粉孢[Oidium taurica（Lév.）E.S.Salman]危害引起的,利用6种空间分布型聚集度指标和Lwao M＊-m回归法对辣椒白粉病空间分布型、不同发病程度与空间分布的关系进行研究.结果表明：辣椒白粉病发生期病株垂直分布下,病株在所有调查田块均属于聚集分布;植株中部、下部叶片水平分布规律,表明3个田块属于聚集分布,其他7个田块属于均匀分布;病情指数（DI）与频次检验垂直分布型的关系,表明DI无论为何值时,垂直方向上分布型均为聚集分布,表现为点片发生;DI与频次检验下部叶片水平分布型的关系,表明DI在0.1827～,0.5160间,呈负二项分布、NeymanA型分布,分布型为聚集分布,表现为点片发生;DI从大于0.5160至等于0.9951时,呈波松分布、二项分布或Poisson-二项分布,分布型为均匀分布,表现为连片发生;病情指数与频次检验中部叶片水平分布型的关系,表明病情指数在0.0623～0.5086间,呈负二项分布、Neyman（n）型分布,分布型为聚集型分布,表现为点片发生;病情指数从大于0.5086至等于0.9858时呈二项分布、波松分布或Poisson-二项分布,分布型为均匀分布,表现为连片发生.

英文摘要：

Pepper powdery mildew is an important disease in pepper growing area, caused by Oidium taurica（Lev.）E.S. Salman. By aggregate indices and Lwao M＇-m regression, 6 spatial distribution patterns and the relationship between different disease severity and spatial distribution, were studied in this research. The result showed that the diseased plants in all survey plots were aggregated distribution under vertical distribution during the occurrence period of pepper powdery mildew, the leaves in central and lower part of plant were horizontal distribution, indicating that three plots were aggregated distribution, and other seven plots were evenly distributed; the relationship of disease index （DI） and frequency of inspection of the vertical distribution type, showed that no matter what value of the DI, the distribution pattern in the vertical direction were aggregated distribution, expressed as point and space occurrence of the disease. The relationship of DI and frequency of inspection of the leaves of lower part of plant with horizontal distribution type, with DI of 0.1827 to 0.5160, was the negative binomial distribution, Neyman Distribution A, the distribution-type was aggregated distribution, expressed as point and space occurrence of the disease; when 0.5160〈DI=0.9951, was Bouasone distribution, binomial or Poisson-binomial distribution, the type was evenly distributed, expressed as the disease occurred in the continuous plot. The relationship of DI and frequency of inspection of the leaves of central part of plant with horizontal distribution type, with DI of 0.0623 to 0.5086, showed a negative binomial distribution, Neyman （n） type distribution, the type was aggregated distribution, expressed as point and space occurrence of the disease; when 0.5086 〈 DI =0.9858, was binomial, Poisson distribution or the Poisson -binomial distribution, the type was evenly distributed, expressed as the disease occurred in the continuous plot.