Author(s):

P Latha and E Rajeswari

Abstract: <em>Sclerotium</em> wilt of Jasmine is an important fungal disease known to cause serious yield loss in Tamil Nadu. Twelve isolates of <em>S. rolfsii</em> collected from various areas of Coimbatore and Erode districts were studied for the cultural, morphological and biochemical variability. The colony characteristics, mycelial and sclerotial characters and oxalic acid production were investigated in all the twelve isolates. Significant variations were observed in the mycelial type, number of sclerotia and production of oxalic acid. The virulence of the isolates were positively correlated with oxalic acid production. Twelve bacterial and fungal isolates were screened <em>in vitro</em> for their antagonism against <em>S. rolfsii</em>. Among the various isolates tested<em>,</em> <em>Bacillus subtilis</em> (EPCo8) and <em>Trichoderma viride1</em> inhibited the mycelial <em>growth of S. rolfsii </em>to an extent of 42.22 per cent and 73.33 per cent respectively<em>. In</em> <em>vitro</em> screening of various fungicides and organic amendments indicated that 100 per cent inhibition of the pathogen with Trifloxystrobin+Tebuconazole 0.15% and Mahua oilcake extract showed 83.07 per cent inhibition.

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