Efficacy of Certain Species of Trichoderma against Blight of Vigna radiata

Alternaria sp attacks Vigna radiata causes many losses in yield. The antagonistic efficiency of Trichoderma spp evaluated in in vitro and in in vivo study against blight disease of Vigna. Trichoderma had shown significant antagonistic activity against Alternaria. Trichoderma species were capable of producing some volatile and nonvolatiles substances which inhibit the growth of the pathogen. Effect of non-volatile substances seems to be more effective on mycelial growth of the pathogen. T. viride was most promising to check the radial growth of the pathogen (100%) wherein T. harzianum exhibited 97.78 per cent inhibition. Studies on the production of hydrolytic enzymes viz., β-1, 3 glucanase and chitinase by four Trichoderma spp were also studied. Field trials with the application of two Trichoderma species were made where T. viride caused reduction of infection of plants to 54.11per cent.