Author(s):

C Kannan, S Senthil Murugan, V Jaiganesh and JP Sajitha

Abstract: Black gram output accounts for about 10 per cent of India’s total pulse production India and it produces about 1.5 to 1.9 million tonnes of black gram annually from about 3.5 million hectares of area, with an average productivity of 500 kg per hectare. Root rot caused by <em>Macrophomina phaseolina </em>(Tassi) Goid is one of the most important fungal diseases of Black gram. It inflicts series economic loss to the crop. It was reported to result in a loss of 28.6 per cent in black gram yield.<em> Trichoderma </em>species are effective biocontrol agents for several soil borne fungal plant pathogens including <em>M. phaseolina </em>and some species are also known for their abilities to enhance systemic resistance to plant disease. Soil application of <em>T</em>. <em>viride </em>significantly controlled the blackgram root rot caused by <em>M</em>. <em>phaseolina</em> by means of several antagonistic mechanisms such as nutrient composition, antibiotic production and mycoparasitism. Results showed <em>in vitro</em> efficiency of antagonist inhibited the mycelial growth. <em>T. viride </em>(Tv₃) recorded the maximum inhibition zone (73.74%), followed by <em>T. viride</em> (Tv₁) which recorded 71.74 percent inhibition on the growth of pathogen over control. The isolate <em>T. viride</em> (Tv₅) recorded the minimum inhibition (69.37%).

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