Characterization of Rhizoctonia solani AG 4HG-III Causing Stem Canker and Wirestem on Green Amaranth and Chinese Amaranth |
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| Authors: | G H Yang H R Chen S Naito and A Ogoshi |
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| Institution: | Authors' addresses: Phytopathology Laboratory of Yunnan Province, Yunnan Agricultural University, Kunming 650201, China;;Graduate School of Agriculture, Hokkaido University, Sapporo, Japan;;Hokkaido Starch Industry Society, Sapporo, Japan (correspondence to G. H. Yang. E-mail: ) |
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| Abstract: | During December 2003, stem canker and wirestem were observed on the stems of green amaranth (Amaranthus viridis) and Chinese amaranth (Amaranthus tricolor) in greenhouses at Ximao district in Yunnnan Province, China. Isolates of Rhizoctonia solani obtained from the two amaranths with stem canker and wirestem, were identical to anastomosis group (AG)‐4. The isolates from diseased plant showed high virulence on young seedlings of two amaranths. Results of sequence analysis of 5.8s rDNA‐ITS of Chinese isolates showed 99–100% sequence similarity with AG‐4HG‐III tester isolates. When compared with other subgroups of AG‐4, Chinese isolates showed similarity levels of 94%. This is the first report of stem canker and wirestem of Green amaranth and Chinese amaranth caused by AG‐4HG‐III and AG‐4HG‐III in China. |
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| Keywords: | stem canter wirestem Green amaranth Chinese amaranth AG 4HG-III |
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