Journal of Biological Control

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Ten isolates of Trichoderma spp. isolated from rhizosphere of different crops were evaluated for their antagonistic potential against five soil borne plant pathogens, viz., Rliizoctonia solani, Fusarium oxysporum f sp radicis-lycopersici, Macrophomina phaseolina and Sclerotium rolfsii using dual culture technique and production of volatile and non-volatile antibiotics. Sclerotial antagonism by the biocontrol strains was tested with R. solani and S. rolfsii. The isolate T2, T4 and T7 against Pythium sp., T1, T7 and T10 against F. oxysporum f. sp radicislycopersici, T3 and T9 against R. solani, T7 against S. rolfsii and T6 against M. phaseolina were the most efficient. The highest percentage inhibition of respective pathogen through the production of certain metabolites of Trichoderma isolates was recorded with T7 against Pythium sp, and Fusarium oxysporum sp. radicis-lycopersici, T1 against R. solani, T5 and T6 against S. rolfsii and T9 isolate against M. phaseolina. Trichoderma isolate T9 and T2 were most effective in inhibition of sclerotia formation, production and germination of sclerotia of R. solani and S. rolfsii, respectively.

Keywords

Antagonistic Potential, Sclerotial Antagonism, Trichoderma Spp., Volatile And Nonvolatile Metabolites.
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