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Title: Field tests of the efficacy of zinc and fatty amine in preventing colonization by copper-tolerant fungi

Author: Lebow, Stan; Woodward, Bessie; Halverson, Steven; West, Michael

Date: 2012

Source: International Biodeterioration & Biodegradation 70(2012) 74-78

Publication Series: Journal/Magazine Article (JRNL)

Description: Ground-contact durability of stakes treated with acidic copper formulations was evaluated. All test formulations incorporated copper, dimethylcocoamine and propanoic acid; one set of formulations also included zinc. Sapwood stakes cut from the southern pine group were pressure-treated to a range of retentions with each formulation and placed into plots within Harrison Experimental Forest in Mississippi and compared with untreated stakes and chromated copper arsenate-treated stakes. Stakes were inspected and given a visual condition rating after 1, 2, 3, 4, 5, and 7 years. Most stakes at higher retentions remained in good condition after 7 years; sporadic failures occurred in all but the highest retention of the zinc formulation. The sporadic nature of fungal attack by a fungus thought to be a strain of Antrodia radiculosa indicates that failures were caused by copper-tolerant fungi. At the concentrations evaluated, neither the dimethylcocoamine nor the propanoic acid offered adequate protection against copper-tolerant fungi. Addition of zinc notably increased decay resistance, and absence of failures at the highest retention may indicate that zinc can help to protect against copper-tolerant fungi. However, the sporadic nature of copper tolerance makes this finding difficult to confirm. Inspection of theses stakes will continue.

Keywords: preservative, field tests, copper, zinc, fatty amine, copper tolerance

Publication Notes:

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  • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

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Lebow, Stan; Woodward, Bessie; Halverson, Steven; West, Michael. 2012. Field tests of the efficacy of zinc and fatty amine in preventing colonization by copper-tolerant fungi. International Biodeterioration & Biodegradation 70: 74-78.

 


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