Abstract

Trichoderma viride was identified as a mycoparasite against Ceratocystis paradoxa. When grown near the pathogen, T. viride was seen entwining around the pathogen mycelium. It was stimulated to produce branches that grew directly to the pathogen mycelium. Firm attachment on the pathogen conidia resulted in the penetration and successful growth of T. viride. Some of the impregnated C. paradoxa were found death. Benlate solution and extracted water-soluble compounds from Trichodermaspecies were evaluated for the control of C. paradoxa. Trichoderma polysporumsignificantly reduced the growth of C. paradoxa at high concentrations (100% and 70%) followed by T. viride, T. hamatum, T. aureoviride and benlate solution recorded average performances. At (50, 30 and 10%) low concentrations, they all recorded poor performances. Minimum inhibitory concentration by T. viride was 10%,T. polysporum 25%, T. hamatum and T. aureoviride were 30% each, and benlate solution remained 50%. T. polysporum exhibited better control of the pathogen when compared with other extracted water soluble compounds from Trichoderma species and benlate solution.       

Key words: Trichoderma, benlate, extraction, water-soluble compounds.