There was great differentiation among ZA,ZB and ZC groups. ZG1 was the predominant race,and its frequency in the total blast fungus population was as high as 26.5%.

• 其中ZA、ZB、ZC 3个种群的分化较强；分别含6、10、7个致病型；其中ZG1为优势致病型；出现频率为26.；5%25。