Characterization of Antagonistic Potential of Trichoderma Spp. against some Soil Borne Plant Pathogens

Abstract

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 T 2 , T 4 and T 7 against Pythium sp., T 1 , T 7 and T 10 against F. oxysporum f. sp radicislycopersici, T 3 and T 9 against R. solani , T 7 against S. rolfsii and T 6 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 T 7 against Pythium sp, and Fusarium oxysporum sp. radicis-lycopersici , T 1 against R. solani , T 5 and T 6 against S. rolfsii and T 9 isolate against M. phaseolina . Trichoderma isolate T 9 and T 2 were most effective in inhibition of sclerotia formation, production and germination of sclerotia of R. solani and S. rolfsii , respectively.