Evaluation of fungal antagonists against Thanatephorus causing web blight of urd and mung bean cucumens
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Authors
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S.C. DUBEY and B. PATEL
Department of Plant Pathology, Birsa Agricultural University, Ranchi 834 006
Keywords:
Thanatephorus cucumeris, Trichoderma viride, T. harzlanum Gliocladium virens, volatile and non-volatile inhibitorsAbstract
Among the six isolates of Trichoderma viride (Tv), T. harzianum (Th) and Gliocladium virens (Gv) (two each) evaluated against Thanatephorus cucumeris (Tc) «Rhizoctonia solani (Rs) causing web blight of urd and mung bean, local (Ranchi) isolates of Tv and Gv were superior over others in growth and inhibition of mycelial growth and sclerotia of Tc in dual culture plate. Nature of mycoparasitism was studied. Two days old culture of Pantnagar isolate of Th inhibited maximum growth of pathogen followed by Gv and Tv through production of volatile substances, whereas 5 days old culture of both isolates of Gv caused cent per cent growth inhibition. Culture filtrate of local isolate of Tv inhibited maximum growth followed by Gv. Agar plate method was better than dip method for evaluation. After 14 days of incubation, almost all monilioid cells were colonised by antagonists and sclerotia lost their viability.
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