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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.