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Agricultural Microbiology Division, NAAS, RDA, Suwon 441-707, Korea(Received 12, November 2012., Revised 27, November 2012., Accepted 3, December 2012)ABSTRACT: Stem canker and tuber rot symptoms were observed on yam grown in Andong and Jinju, Koreain 2011. A total of 20 isolates of Rhizoctonia and allied fungi were obtained from the symptomatic plants. Amongthe isolates, 8 isolates were identified as Rhizoctonia solani and 12 isolates as Ceratobasidium sp. based on rDNA-internal transcribed spacer (ITS) sequence similarity. In the cluster analysis of rDNA-ITS sequences, 7 isolates ofR. solani belonged to AG 2-2IIIB and remaining one to AG 1-1A. In addition, among the 12 isolates of Cera-tobasidium sp., 7 isolates belonged to AG-Fa, three isolates to AG-A and the other two isolates to AG-Fb and AG-O, respectively. Pathogenicity tests showed that all the R. solani AG 2-2IIIB isolates are pathogenic on stem andtuber of yam but R. solani AG 1-1A and all the Ceratobasidium isolates are non-pathogenic. The results indicatethat R. solani AG 2-2IIIB is an important pathogen causing stem canker and tuber rot on yams grown in thestudy areas. This is the first report of R. solani AG 2-2IIIB causing stem canker and tuber rot of yam in Korea.KEYWORDS : Rhizoctonia solani, Stem canker, Tuber rot, Yam

Occurrence of Stem Canker and Tuber Rot on Yam Caused by Rhizoctonia solani AG 2-2IIIB in Korea