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Title: Copper tolerance of brown-rot fungi : oxalic acid production in southern pine treated with arsenic-free preservatives

Source: International biodeterioration & biodegradation. Vol. 56 (2005): Pages 75-79.

Author(s)Green, Frederick; Clausen, Carol A.

Publication Year: 2005  View PDF »

Category: Journal Articles

Abstract: The voluntary withdrawal of chromated copper arsenate (CCA)-treated wood from most residential applications has increased the use of non-arsenical copper-based organic wood preservatives. Because the arsenic component of CCA controlled copper tolerant fungi, scientists have renewed interest in and concern about the decay capacity in the important copper-tolerant group of brown-rot fungi. We have demonstrated that the primary means of inactivating copper in preservatives is by excess production of oxalic acid (OA). Oxalic acid production is a key metabolic indicator of brown- rot decay, and our objective was to estimate the production of OA in five commercial or experimental arsenic-free preservatives. Ten aggressive brown-rot fungi, chosen from previous studies and representing the genera Antrodia, Coniophora, Gloeophyllum, Postia, Serpula, Tyromyces, and Wolfiporia, were tested against southern yellow pine (SYP) blocks that were vacuum-treated with ground contact retentions of copper naphthenate, amine copper azole, alkaline copper quat type D (ACQ-D), N,N-naphthaloylhydroxylamine (NHA), and copper borate in a 12-week soil-block test. After determination of block weight loss, blocks were also tested for the presence of OA. Weight loss ranged from 0.3% to 8.3% for treated blocks and from 16.4% to 59.6% for untreated controls. We conclude that SYP treated with these five preservatives limited OA production and prevented decay, and thus confirmed the efficacy of the co-biocides against coppertolerant fungi.

Keywords: Brown-rot decay; copper-tolerant fungi; oxalic acid

File size: 70 kb(s)

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RITS Product ID: 16808
Current FPL Scientists associated with this product (listed alphabetically)
Clausen, Carol A.
Supervisory Research Microbiologist
Green, Frederick
Research Microbiologist

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