Graduate Thesis Or Dissertation
 

Ability of selected fungi from Douglas-fir poles to degrade wood and their tolerance to wood-preserving chemicals

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  • Wood degrading ability and tolerance to wood-preserving chemicals of several fungi isolated from Douglas-fir utility poles were investigated by the agar-stick and soil-block methods. Birch (Betula. sp. ) wood sticks and western hemlock (Tsuga heterophylla) wood blocks were used. The soil-block and agar-stick tests provided identical weight loss rankings of the eight fungi from Douglas-fir poles. Breaking radius appeared to be a more sensitive and rapid indicator of decay than was weight loss and provided a reasonable basis for detecting decay fungi. Decay caused by the brown-rot fungi, Poria carbonica and Poria monticola was more severe with increase in incubation time expressed either as strength reduction or weight reduction. The white-rot fungus, Schizophyllum commune caused relatively little weight loss and gave erractic results. Except for Phialophora fastigiata., the fungi-imperfecti caused relatively little weight loss but a relatively large change in breaking radius after twelve weeks. In the preservative tolerance test, the brown-rot fungi were highly resistant to ammoniacal copper arsenite and moderately tolerant to creosote and pentachlorophenol. The white-rot fungus was susceptible to all preservatives except creosote. The fungi-imperfecti, Hyalodendron lignicola and Phialophora fastigiata were highly tolerant to all preservatives. In a study of classifying hymenomycetes isolated from Douglasfir utility poles into brown-and white-rot fungi by the oxidase test method, brown-rots were more prevalent than white-rot fungi. The intensity of the oxidative reaction and the time required showed considerable variation among the white-rot fungi.
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