National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692 Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
Native isolates of groundnut stem rot casual organism, Sclerotium rolfsii Sacc. were collected from major groundnut growing areas of Tamil Nadu. Selected isolates were screened, characterized and identified the virulent isolate. Morphology and spore structure of isolated antagonists, GNRAJK1 and GNRAVR14 were studied. The genus and species level of the antagonists was identified as Streptomyces violaceusniger and Streptomyces exfoliatus. The antagonistic activities of Streptomyces violaceusniger were found to be effective in reducing the mycelial growth, sclerotial formation and germination. The Streptomyces violaceusniger treated cultures were shown reduced mycelial growth (85.00%) and reduced sclerotial production (87.86%). The effect of crude antibiotics and volatiles of S. violaceusniger, S. exfoliates and P. fluorescens were studied against S. rolfsii, the results revealed the percent mycelial growth reduction of S. rolfsii over control by S. violaceusniger and S. exfoliatus were 69.56 and 66.17 per cent respectively. This study provides a theoritical and practical explanation of an antagonist explored for control of stem rot caused by Sclerotium rolfsii.
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