M. P. Uma Maheswari ¹, M. Muthusamy ¹, D. Alice ²

Affiliations
1 Agricultural College and Research Institute, Killikulam, Vallanad 628 252, Tamil Nadu, IN
2 Agricultural College and Research Institute, Coimbatore 641 003, Tamil Nadu, IN

Abstract

The effectiveness of four species of Trichoderma namely T. viride Pres. ex. S. F. Gray, T. longibrachiatum Rifai, T. reesei Simmons, and T. harzianum Rifai, Gliocladium virens J. H. Miller, Giddens and Foster, two bacterial antagonists namely Pseudomonas fluorescens Migula and Bacillus subtilis (Chun) Praznowski and Saccharomyces cerevisiae Hansen was tested against Sclerotium rolfsii Saec. causing jasmine (Jasminum sambac L.) wilt. P. fluorescens, B. subtilis and T. viride were found effective against sclerotial wilt. The volatile metabolites produced by these antagonists were also effective against S. rolfsii in vitro. The sclerotial germination of S. rolfsii was effectively inhibited by P. fluorescens, B. subtilis and T. viride. All the antagonists tested, except S. cerevisiae were effective in inhibiting the production of oxalic acid. Soil application of talc based commercial formulation of P. fluorescens @ 20 g/pot, B. subtilis and T. viride @ 25g/pot effectively reduced the wilt disease incidence in the pot culture experiment.

Keywords

Bacillus subtilis, Jasmine Wilt, Oxalic Acid, Pseudomonas fluorescens, Sclerotium rolfsii, Talc Based Commertial Formulations, Trichoderma viride, Volatile Metabolites.

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