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1998年秋在辽宁省14个县区的水稻产田和试验田中96个品种（系）上采集的115份稻瘟病标样中，采用单孢分离法分离出74个单孢菌株。经在7个中国鉴别品种上进行鉴定，74个单孢菌株划分为7群18个生理小种；其中在辽宁省流行的优势种群为ZD群和ZF群；同1997年相比，ZD群小种稳中有降，ZF群小种又有上升，重新成为优势种群；1985年导致中丹2号水稻抗瘟性丧失的ZA_（61）小种再度出现；ZG群小种虽然出现频率不高，但又显上升势头。
In the autumn of 1998, 115 isolates of blast disease collected from 96 cultivars (lines) of paddy field and experimental field in 14 counties of Liaoning Province were isolated by single spore separation. The seventy-eight isolates were divided into seven groups of 18 physiological races. Among them, the dominant populations in Liaoning province were ZD group and ZF group. Compared with 1997, ZD group was smaller ZS group races increased again and became the dominant species again. ZA_ (61) races which caused the loss of blast resistance of Zhongdan 2 in 1985 reappeared; while the occurrence frequency of ZG races was not high , But the upward trend.