Author(s):

Pankaj Tiwari, DN Shukla, UB Singh and Sanjeev Kumar

Abstract: Efficacy of three Trichoderma species viz. T. harzianum, T. virens and T. viride against F. solani were tested by Dual Culture technique. T. virens and T. viride grew very fast before touching the colony of the F. solani. Thereafter, their growth was significantly slowed down. But T. harzianum grew very fast over the colony of F. solani: thus completely covering it within 8 days. T. viride secreted yellow pigment zone around its colony. The yellow pigment caused lysis of the colony of F. solani. Thereafter the mycelia of T. viride grew over this cleared zone. It took around 13 days to completely destroy the colony of F. solani, T. virens took larger period (about 14 days) to smoothed the colony of the pathogen.

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