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采用主成分分析法对浦江县病虫测报站１９７４～１９９４年褐飞虱发生的有关历史资料进行了分析．结果表明，前６个主成分的累计方差贡献率达８９．５９９％，超过８５％．７月份降雨量、平均最高气温、大雨频数及晚稻前期田间虫量是影响浦江县晚稻第五代褐飞虱发生程度的主要因子
Principal component analysis was used to analyze the historical data about the occurrence of BPH in Pujiang County from 1974 to 1994. The results show that the cumulative variance of the first six principal components contributes 89.599%, more than 85%. The main factors affecting the occurrence of the brown planthopper of the fifth generation of late rice in Pujiang County in July were rainfall, average maximum temperature, heavy rain frequency and field pests in late rice.