The effectiveness of silica treatments against wood-boring invertebrates
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Laurie James Cookson
Abstract
Timber specimens were impregnated with the organo-silicate tetraethyl orthosilicate (TEOS) in an effort to deposit hard silica granules and improve resistance to wood-borers. Trials were conducted against marine borers (teredinids and Limnoria), the termite Coptotermes acinaciformis, and the wood-boring beetle Lyctus brunneus. A 14-week laboratory bioassay against C. acinaciformis showed that treated Pinus radiata containing 16.7 wt.% silica was as readily attacked as untreated timber. However, a 3-year laboratory trial of treated Castanospermum australe showed that attack by L. brunneus was prevented by 10.3 wt.% silica, and reduced by 0.7 and 3.4 wt.% silica. A trial of wood treated with copper-chromium-arsenic followed by silicon was conducted in the sea at Townsville, Australia for 7 years. Double treatment with 6.7 or 19.2 wt.% silica prevented attack in P. radiata by teredinids, while for CCA alone some replicates failed. In the same trial, double-treated Corymbia maculata with lower silica retention failed. Silica granules may overwhelm the food and waste-sorting mechanisms in teredinids and lyctine larvae, whereas borers, requiring less intimate contact with granules (Limnoria and termites), or those that do not ingest wood for food (Sphaeroma and Martesia), are little affected.
©2007 by Walter de Gruyter Berlin New York
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- Obituary Anders Björkman (1920–2006)
Articles in the same Issue
- To all readers, authors and subscribers
- Vapor-phase diethyl oxalate pretreatment of wood chips: Part 1. Energy savings and improved pulps
- Vapor-phase diethyl oxalate pretreatment of wood chips: Part 2. Release of hemicellulosic carbohydrates
- Size exclusion chromatographic and UV-VIS absorption analyses of unbleached and bleached softwood kraft pulps using LiCl/1,3-dimethyl-2-imidazolidinone as a solvent
- A new method for the titration of free phenolic groups in pulps
- Adsorption of water-soluble organic dyes on ferrofluid-modified sawdust
- Mechanical properties and creep behavior of lyocell fibers by nanoindentation and nano-tensile testing
- Deformation behavior of wet lignocellulosic fibers
- Changes in physical, mechanical and chemical properties of wood during sterilisation by gamma radiation
- Penetration of poly(ethylene glycol) into wood cell walls of red pine
- Transverse mechanical behaviour and moisture absorption of waterlogged archaeological wood from the Vasa ship
- Determination of residual stress in bonded wood components
- Decohesion of glue bonds in wood connections
- Delamination assessment after drilling medium-density fibreboard (MDF) by digital image analysis
- Effects of thinning and fertilisation on tracheid dimensions and lignin content of Norway spruce
- Detection of β-1-4-galactan in compression wood of Sitka spruce [Picea sitchensis (Bong.) Carrière] by immunofluorescence
- Laboratory and outdoor water repellency and dimensional stability of southern pine sapwood treated with a waterborne water repellent made from resin acids
- Evidence of fungicidal and termicidal properties of Prunus africana heartwood extractives
- The effectiveness of silica treatments against wood-boring invertebrates
- Sap-staining fungi from logs and boards of two commercially important pines in Korea
- Improved quantitative determination of benzalkonium chloride in treated wood by liquid chromatography
- Obituary Anders Björkman (1920–2006)
