Authors: Yang, Dian-Qing; Wang, Xiang-Ming; Wan, Hui

Source: BioControl, Volume 52, Number 4, August 2007 , pp. 559-571(13)

Publisher: Springer

Abstract:

The objective of the present study was to develop a biological technology that would protect logs destined for oriented strand board (OSB) manufacturing from biodegradation. Aspen, red maple, and yellow birch trees were felled in one summer and the logs either debarked or not debarked, and either treated or not treated with a biological product of Gliocladium roseum. The logs were piled in different treatment groups and stored in a yard for 5 months and 1 year before evaluation. The results showed that all untreated logs, with or without bark, were seriously degraded by moulds, stain and decay fungi after a summer storage period of 5 months. The logs with bark were more degraded than the debarked logs, and the log ends were more degraded than the middle sections. After 5 months, 55-83% of the surface area of the wood discs was degraded in untreated logs. The biological treatment was effective, and only 4-16% of the surface area of the wood discs in treated logs was infected by various fungi. Strands cut from untreated logs consisted of 50-75% grey- or blue-stained strands, whereas those cut from biologically treated logs consisted of 10-25% such strands. Panels made using biologically treated logs had a lower thickness swelling and water absorption values compared to panels made using freshly cut logs and untreated stored logs. The other physical and mechanical properties of the various panels made in this test were comparable. In terms of mould resistance, all panels made from fungal-treated logs had a better mould resistance than those made from freshly cut and untreated logs.

Keywords: Biological control; Decay; Gliocladium roseum; Hardwood log; Mould; Oriented strand board; Stain

Document Type: Research article

DOI: http://dx.doi.org/10.1007/s10526-007-9069-1

Affiliations: 1: Email: dian-qing.yang@qc.forintek.ca

Publication date: 2007-08-01

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