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用 7个中国统一鉴别品种对 1997～ 1999年采集自江苏省吴江、赣榆、通州、高邮和宜兴等 5个代表地区的 32 4个稻瘟病菌株进行了小种鉴定。 3年中共检测到 2 1个小种 ,其中以ZG1小种出现频率最高 ,达 5 7 80 %～ 6 7 89% ,为优势小种 ;其次为ZE3 小种 ,出现频率为 16 5 0 %～ 19 81% ;其它小种出现频率较低。各地区小种的组成及年度间变化存在较大差异 ,宜兴地区小种组成简单 ,3年均以ZG1小种为优势小种 ;吴江地区小种组成复杂 ,优势小种变化较大 ;通州地区小种数量显著增加 ,ZG1小种的优势明显下降 ;赣榆地区的小种数量则明显减少。各地小种的组成及变化与水稻主栽品种的布局及更替密切相关
A total of 32 Chinese strains of Magnaporthe grisea from 1997 to 1999 collected from five representative areas of Wujiang, Ganyu, Tongzhou, Gaoyou and Yixing in Jiangsu Province were identified by using 7 Chinese common identification cultivars. In the 3 years, 21 minor races were detected, of which ZG1 races appeared the highest frequency (5780% ~ 67 89%), followed by ZE3 races with the frequency of 165.0% 19 81%; other races appear less frequently. The composition and annual variation of races in different regions were quite different. The races in Yixing were simple in composition with ZG1 races as the dominant races for three years. The races in Wujiang were more complex with more races in dominant races. Tongzhou The number of races increased significantly, and the advantages of ZG1 races decreased obviously. The number of races in Ganyu decreased significantly. The composition and variety of races in various regions are closely related to the layout and replacement of main varieties of rice