Tolerance of Some Canadian Strains of Wood-Rotting Fungi to Wood Preservatives

Eleven strains of wood-rotting fungi from six species, frequently isolated from wood in service in eastern Canada, were tested for tolerance to sodium arsenate (Na2HAs04), pentachlorophenol (PCP), sodium fluoride (NaF), 2, 4-dinitrophenol (DAP), cupric sulphate (CuSO4), and sodium borate (Na2B407). The soil-block method was used with NA2HAs04, PCP, and NaF and a malt-agar method with all six preservatives. The general, order of tolerance was, in the soil-block tests: NaF > PCP > Na2HAs04, in the malt-agar tests: NaF > Na2B407> CUSO4 > Na2HAs04 > DAP >PCP. The range of variation in tolerance was wider in response to Na2HAs04, PCP, and DAP than to the other preservatives. In soil-block tests the highest tolerance to Na2HAs04 and to PCP was shown by Coniophora puteana A328 and to NaF by Coriolellus serialis A269. Since these strains also caused rapid weight loss with low variability on the untreated wood, their inclusion into standard tests is suggested for wood preservatives to be used in eastern Canada.

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