997～ 1 999年从湖北省襄樊、黄冈、荆州、宜昌等各主要麦区小麦纹枯病病株标样上分离出丝核菌 6 5株 ,其中双核丝核菌 43株 ,多核丝核菌 2 2株。分别与双核和多核丝核菌融合群国际标准菌株进行测试表明 ,湖北省小麦纹枯病病原菌属于RhizoctoniacerealisAGD (CAG1)和R .solaniAG5、AG4 、AG2 -2IIIB、AG1-IC,相应菌株数分别为 43、 1 2、 6、 2、 2 ,出现频率分别为 6 6 2 %、 1 8 5 %、 9 2 %、3 1 %、 3 1 % From 1995 to 1999, 65 strains of Rhizoctonia were isolated from the samples of wheat sheath blight disease from Xiangfan, Huanggang, Jingzhou and Yichang in Hubei Province, of which 43 strains were Rhizoctonia solani, 2 2 strains. The results showed that Rhizoctonia cerealis AGD (CAG1) and R. solani AG5, AG4, AG2-2IIIB and AG1-IC were the main pathogens of wheat sheath blight in Hubei Province, and the corresponding strains were 43 , 1 2, 6, 2, 2, the frequency of occurrence was 6 6 2%, 1 85%, 92 2%, 3 1%, 3 1%