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Impact of thermal modification on bioresistance of North American wood species, Pinus banksiana, Populus tremuloides, and Betula papyrifera, against wood-rotting basidiomycete fungi

Lekounougou, S., Kocaefe, D.
Wood material science and engineering 2014 v.9 no.2 pp. 67-75
Betula papyrifera, Pinus banksiana, Populus tremuloides, Rhodonia placenta, Trametes, decay fungi, decay resistance, engineering, materials science, virulence, weight loss, wood
In this study, the decay resistance of untreated and thermally modified jack pine (Pinus Banksiana) , aspen (Populus tremuloides) , and white birch (Betula Papyrifera) was evaluated. Wood specimens were exposed to laboratory decay resistance tests using the wood-rot fungi, Trametes. versicolor , Poria placenta , and Gloephyllum trabeum for 2–12 weeks of incubation. The results indicated that, T. versicolor fungus was virulent against all the three untreated woods, B. papyrifera (73.9% weight loss), P. tremuloides (57.1% weight loss), and P. banksiana (43.5% weight loss). P. placenta fungus affected B. papyrifera (52.4% weight loss), P. banksiana (52.3% weight loss), and P. tremuloides (36.7% weight loss). G. trabeum fungus was virulent against P. banksiana (41.53% weight loss), but less active against B. papyrifera (11.6% weight loss) and P. tremuloides (21.9% weight loss). It was found that the weight losses due to T. versicolor fungus activity were reduced for P. banksiana (1.5% weight loss) thermally modified at 210 °C, B. papyrifera (27.9% weight loss) at 215 °C, and P. tremuloides (9% weight loss) at 220 °C compared to the weight losses of their untreated counterparts. These correspond to 96.5%, 62.2% and 84.2% of decrease in weight loss, respectively. Similar results were obtained with G. trabeum fungus. On the contrary, thermal modification on the deterioration of P. banksiana (39.1% weight loss) by P. Placenta was affected less resulting in only 25.2% weight loss relative to untreated wood.