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用７个全国统一鉴别品种对１９８０～１９９４年从吴江稻区采集的１３３份稻瘟病标样的单孢菌株进行小种鉴定，得到６群１１个小种。其中，中 Ｇ１ 小种出现频率最高，占４６５％ ，为优势小种。监测圃中稻瘟病菌小种的动态与人工接种鉴定的结果基本一致。稻瘟病菌各小种的发生频率年度间变化较大，小种的更替与栽培品种有直接的关系。通过筛选广谱抗性品种及主栽品种的抗性基因分析，初步得到１２个具有广谱抗性的品种（系），其中“９３３１”等可在生产上推广应用及作为抗源供育种部门利用。
Seven monotypic strains of rice blast isolates collected from Wujiang rice area in 1980-1994 were identified by means of seven national uniform varieties. Six small breeds of 11 breeds were obtained. Among them, the highest frequency of G1 race, accounting for 46 5%, as the dominant race. Monitoring nursery blast race bacterium dynamics and artificial inoculation identification results are basically the same. The occurrence frequency of races of Magnaporthe grisea varied greatly from year to year, and the change of races was directly related to cultivars. Twelve broad-spectrum resistant cultivars (lines) were obtained by screening broad-spectrum resistant varieties and resistance gene analysis of main cultivars. Among them, “9331” could be widely used in production and as source of resistance Breeding department to use.