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Title: Long-term efficacy of wood dip-treated with multicomponent biocides

Source: International Research Group on Wood Protection. Section 3, Wood Protecting Chemicals : 36th annual meeting, Bangalore, India, April 24-28, 2005. Stockholm, Sweden : IRG Secretariat, 2005. 7 pages.

Author(s)Clausen, Carol A.; Yang, Vina W.

Publication Year: 2005  View PDF »

Category: Journal Articles

Abstract: Biocides designed for prevention of indoor mold growth on wood-based materials need to provide long-term protection under conditions of high humidity. Specimens of kiln-dried southern pine and unseasoned southern pine, aspen, and Douglas-fir were dip-treated with borate-dimethylcocoamine (DMCA) supplemented with voriconazole, thiabendazole, or thujaplicin and evaluated at 4-week intervals for inhibition of three mold fungi, Aspergillus niger, Penicillium chrysogenum, and Trichoderma viride, using the ASTM D4445 mold test. After 8 weeks, all treatments of aspen and Douglas-fir inhibited growth of test fungi, while kiln-dried pine only inhibited A. niger and unseasoned pine only inhibited T. viride despite average chemical retentions in pine up to four-fold greater than those in aspen and Douglas fir. After 12 weeks, aspen and Douglas-fir treated with the thiabendazole-containing biocide continued to provide protection against growth of the test fungi. The thujaplicin-containing biocide provided partial protection of aspen and Douglas-fir for 12 weeks but failed to protect pine samples beyond 4 weeks. A comparison of tebuconazole, propiconazole, voriconazole, and thiabendazole in the borate-DMCA biocide system showed that thiabendazole and voriconazole provided superior protection against the test fungi, particularly T. viride. We conclude that multicomponent biocides with thiabendazole protect aspen and Douglas-fir against growth of test fungi for at least 12 weeks under the conditions of the ASTM 4445 mold test.

Keywords: Mold fungi; biocide; borate; azole; thujaplicin

File size: 148 kb(s)

This publication is also viewable on Treesearch:  view
RITS Product ID: 16726
Current FPL Scientist associated with this product
Clausen, Carol A.
Supervisory Research Microbiologist

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