Cultural and pathogenic variations in the isolates of Rhizoctonia species causing root rot of cotton
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Authors
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D. MONGA and SHEO RAJ
Central Institute for Cotton Research, Nagpur 440 016
Keywords:
Cotton, root rot, Rhizoctonia so/ani, Rhizoctonia bataticola, variabilityAbstract
Thirteen isolates of Rhizoctonia solani were categorised into four distinct groups on the basis of cultural characteristics. Isolate in group Rs-2 showed fastest mycelial growth whereas those belonging to group Rs-4 exhibited minimum mycelial growth. Isolates belonging to groups Rs-I and Rs-2 produced bigger and smaller sclerotia respectively and were more pathogenic on cotton seedlings than isolates in group Rs-3 and Rs4 which only produced mycelial aggregates. Seven isolates of R. bataticola also differed in cultural characters including sclerotial size and number. Two isolates of R. bataticola also showed differences in pathogenicity on cotton seedlings.
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