Laboratory evaluation of the termiticidal efficacy of copper HDO |
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Authors: | Gyu-Hyeok Kim Won-Joung Hwang Tsuyoshi Yoshimura Yuji Imamura |
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Institution: | (1) Department of Entomology and Plant Pathology, Auburn University, Auburn, Alabama, 36849;(2) Biological Department, Boston University, 121 Bay State Road, Boston, Massachusetts, 02215 |
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Abstract: | A laboratory no-choice termite bioassay was conducted to evaluate the ability of copper HDO (CX-A or copper xyligen) to protect
radiata pine (Pinus radiata D. Don) wood samples from attack by two subterranean termite species, Reticulitermes speratus and Coptotermes formosanus. A series of sapwood samples were pressure treated with either 0.25%, 0.50%, 0.75%, or 1.00% copper HDO solution. Samples
treated with equivalent concentrations of a benchmark preservative, CCA-C, were used as treated controls. All samples (including
controls) were subjected to an artificial weathering schedule before the bioassay. The samples were exposed to 30-day R. speratus tests and 3-week C. formosanus tests. Copper HDO was shown to deter termites from significant feeding on the treated wood. At a retention of 5.8 kg/m3 (treated
with 0.75% solution) or higher, the mass loss from termite feeding did not exceed 3% for both the 30-day R. speratus tests and the 3-week C. formosanus tests. At each of the retentions tested, copper HDO performed comparably with equivalent retentions of CCA-C; however, field
data are needed to validate these laboratory results. The preliminary findings are that copper HDO pressure treatment has
potential as a viable method of protecting wood from attack by both termite species tested. |
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