The leachability and specificity of the biological protection of timber using Scytalidium sp. and Trichoderma spp
P I Morris, N A Summers, D J Dickinson
The results of field experiments, using biological control against internal decay of creosoted poles, are briefly reviewed and the evidence concerning the leachability of the antibiotics produced by these species is presented. A pure culture miniblock decay test on biological control treated pine sapwood is described and the results compared to previously published data. The protection against Lentinus lepideus (Fr. ex Fr.) Fr. conferred on wood blocks by Scytalidium sp. and Trichoderma sp. was found to be completely removed by 24 hours Soxhlet leaching. Weight losses caused by Coniophora puteana (Schum ex Fr.) Karst were not reduced by prior colonisation of blocks with the potential biological control fungi. The significance of this finding is discussed in the light of the high frequency of isolation from poles of wood rotting basidiomycetes other than Lentinus lepideus and the latest results of a six year old field experiment.