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Title: Wood color changes and termiticidal properties of teak heartwood extract used as a wood preservative

Source: Holzforschung. 74(3): 233-245.

Author(s)Brocco, Victor Fassina; Paes, Juarez Benigno; Costa, Lais Gonçalves da; Kirker, Grant T.; Brazolin, Sérgio

Publication Year: 2020  View PDF »

Category: Journal Articles
Associated Research Project(s):   FPL-4723-2A

Abstract: The aim of this study was to evaluate the change in colorimetric patterns and the termite resistance of lightcolored and low durability wood when impregnated with teak (Tectona grandis) heartwood extractives. Hot water and ethanol extracts were obtained from 20-year-old teak heartwood and used to evaluate the influence on color change and the natural resistance of 10-year-old teak sapwood and Pinus sp. For wood impregnation, a full-cell (Bethell) treatment was conducted. To verify the influence of the teak extracts, the colorimetric patterns of wood were determined using the Munsell and CIE-L*a*b* systems. Choice and no-choice feeding tests were performed under laboratory conditions to test the efficacy of the teak extract solutions against two termite species Nasutitermes corniger and Cryptotermes brevis. All of the extract solutions promoted a significant darkening of the wood, bringing the color of the impregnated wood closer to older teak heartwood than the untreated samples of the respective species. Ethanol extracts increased the resistance and mortality against N. corniger in both choice and no-choice tests. Resistance to C. brevis was not clearly affected.

Keywords: eco-friendly preservative; natural extracts; Tectona grandis; termite resistance; wood color modifier; wood protection

Publication Review Process: Formally Refereed

File size: 1,024 kb(s)

Date posted: 03/06/2020

This publication is also viewable on Treesearch:  view
RITS Product ID: 97192
Current FPL Scientist associated with this product
Kirker, Grant
Research Forest Products Technologist
  

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