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http://dx.doi.org/10.4489/KJM.2012.40.4.266

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

Hong, Sung Kee (Crop Protection Division, National Academy of Agricultural Science (NAAS), Rural Development Administration (RDA))
Lee, Jae Kook (Crop Protection Division, National Academy of Agricultural Science (NAAS), Rural Development Administration (RDA))
Lee, Young Kee (Crop Protection Division, National Academy of Agricultural Science (NAAS), Rural Development Administration (RDA))
Lee, Sang Yeob (Agricultural Microbiology Division, NAAS, RDA)
Kim, Wan Gyu (Agricultural Microbiology Division, NAAS, RDA)
Shim, Hong Sik (Crop Protection Division, National Academy of Agricultural Science (NAAS), Rural Development Administration (RDA))
Publication Information
The Korean Journal of Mycology / v.40, no.4, 2012 , pp. 266-270 More about this Journal
Abstract
Stem canker and tuber rot symptoms were observed on yam grown in Andong and Jinju, Korea in 2011. A total of 20 isolates of Rhizoctonia and allied fungi were obtained from the symptomatic plants. Among the 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 of R. solani belonged to AG 2-2IIIB and remaining one to AG 1-1A. In addition, among the 12 isolates of Ceratobasidium 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 and tuber of yam but R. solani AG 1-1A and all the Ceratobasidium isolates are non-pathogenic. The results indicate that R. solani AG 2-2IIIB is an important pathogen causing stem canker and tuber rot on yams grown in the study 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;
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