Variations in Preservative Tolerance of Wood-Destroying Fungi

Comparative tolerances of Lenzites trabea (Madison culture 617), Lentinus lepideus (Madison 635), and Poria monticola (Madison 575) to creosote, phenyl mercury oleate, copper naphthenate, and pentachlorophenol were determined according to the standard method of the National Woodwork Manufacturers Association, 1951. Test blocks of Pinus ponderosa sapwood were treated to retain amounts of preservative at levels above and below the estimated threshold for each fungus-preservative combination. A series of 8 treated blocks at each level were incubated for 63 days at 80?F. in bottles containing heavy mats of fungus mycelium. Weight loss of incubated blocks was taken as evidence of tolerance of fungi for the preservative. Threshold retentions (lbs. per cu.ft.), of pentachlorophenol, copper naphthenate, phenyl mercury oleate, and creosote were respectively for Lenzites trabea 0.224, 0.047, 0.0071, 3.6; for Lentinus lepideus 0.133, 0.035, 0.0032, 6.0; for Poria monticola 0.168, no threshold at 0.093, 0.0058, 3.6.

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