To study the Efficacy of Trichoderma harzianum against phytopathogenic fungi

Trichoderma species are significant potential bioagents that can combat a variety of soil-borne fungal infections. Compared to their counterparts (bacteria, nematodes, viruses, and protozoa), Trichoderma based biocontrol agents are more effective at promoting plant growth and soil remediation activities. Cultural characteristics of T. harzianum isolates showed light green sporulation throughout the plates and fluffy growth at margin. T. harzianum significantly highest mycelial inhibition was observed by Fusarium oxysporum f.sp. lycopersici(75.00 %) with 22.00 mm average colony diameter after seven days of incubation which was followed by Macrophomina phaseolina (55.73%), Sclerotium rolfsii (60.00%) isolates with average colony diameters 34.10 mm respectively. T. harzianum showed maximum antagonistic potential in dual culture technique against Sclerotium rolfsii, Macrophomina phaseolina and F. oxysporum f. sp. Lycopersici. whereas T. harzianum isolates showed maximum antagonistice effect to F. oxysporum f. sp. Lycopersici followed by Sclerotium rolfsii, Macrophomina phaseolina