Efficacy of chlorothalonil against 15 wood decay fungi

Chlorothalonil is a commercially important fungicide with many industrial and agricultural applications. It is currently being evaluated as a wood preservative. A comparison of the wood preservative efficacies of chlorothalonil, pentachlorophenol, and chromated copper arsenate (CCA) was made using standard laboratory soil block methodologies. Fifteen fungal strains recommended by American Wood Preservers’ Association Standard E10-91 were tested. As has been previously reported in laboratory tests, CCA did not perform well, having relatively high toxicity thresholds against the test fungi. Chlorothalonil and pentachlorophenol were more efficacious, and showed comparable preservative activity when tested against Gloeophyllum trabeum (ATCC 11539), Trametes versicolor (ATCC 12679), Postia placenta (ATCC 11538), Irpex lacteus (ATCC 1l245), Neolentinus lepideus (ATCC 12653), Pleurotus ostreatus (ATCC 32237), Coniophora puteana (ATCC 12675), Serpula lacrymans (ATCC 11485), Trametes lilacino-gilva (ATCC 46156), Fomitopsis palustris (ATCC 11088), and Trametes hispida (ATCC 36206). Four of the strains did not cause significant decay in untreated wood control blocks. These strains of the species –Serpula incrassata (ATCC 11236), Antrodia xantha (ATCC 11086), Xylobolus frustulatus (ATCC 12682), and Phellinus pini (ATCC 12240) — may not be suitable for use in soil block tests.

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