Control of growth of wood decay Basidiomycetes by Trichoderma spp. and other potentially antagonistic fungi

Isolates of Trichoderma and Aspergillus were tested against Trametes versicolor and Neolentinus lepideus by agar interaction tests and by measuring the toxicity of culture filtrates. Some isolates were able to overgrow and kill both of the decay fungi in agar culture but others were totally ineffective. Although the filtrate from most isolates produced some growth inhibition of the two target fungi, the extent of the control varied widely. Three fungi that produced the greatest inhibitory effects (two Trichoderma and one Aspergillus isolate) were subsequently tested against a range of brown- and white-rot Basidiomycetes. The filtrates of all three isolates produced varying degrees of inhibition against each of the Basidiomycetes. However, the Aspergillus filtrate generally produced greater inhibition and was more effective against the white-rot Basidiomycetes. The implications of the results on the testing and use of nondecay antagonistic fungi for the biological control of wood decay are discussed.

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