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１９９１～１９９５年５年间，共分离测定了辽宁省稻瘟病菌２４９个单孢菌株，经７个中国鉴别品种鉴定划分为７群２８个生理小种，在辽宁省流行的优势种群为ＺＦ群和ＺＤ群。近年来致病性强的籼型小种及粳型小种强致病类群出现频率增加，弱致病类群频率下降。１９８５年导致中丹２号水稻抗瘟性丧失的ＺＡ６１小种１９９５年又重新出现，前几年表现优势的ＺＧ群小种１９９５年暂时消失。
From 1991 to 1995, 249 monosomyces isolates of Magnaporthe griseus from Liaoning Province were isolated and identified. The seven Chinese isolates were divided into 7 groups of 28 physiological races. The dominant populations in Liaoning province were ZF group and ZD group. In recent years, the pathogenicity of indica races and japonica races have increased their frequency of occurrence, and the frequency of weak pathogenic groups has decreased. The ZA61 races that led to the loss of resistance to rice blast of Zhongdan 2 in 1985 reappeared again in 1995, and the ZG group races which had been dominant for a few years ago temporarily disappeared in 1995.