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- Title
The effectiveness of silica treatments against wood-boring invertebrates.
- Authors
Laurie James Cookson; Damian Kile Scown; Kevin James McCarthy; Narelle Chew
- Abstract
AbstractTimber 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. acinaciformisshowed that treated Pinus radiatacontaining 16.7 wt. silica was as readily attacked as untreated timber. However, a 3-year laboratory trial of treated Castanospermum australeshowed that attack by L. brunneuswas 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. radiataby teredinids, while for CCA alone some replicates failed. In the same trial, double-treated Corymbia maculatawith 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 (Limnoriaand termites), or those that do not ingest wood for food (Sphaeromaand Martesia), are little affected.
- Subjects
AUSTRALIA; WOOD decay; PRESERVATION of wood; TIMBER; FOREST products; MARINE borers
- Publication
Holzforschung: International Journal of the Biology, Chemistry, Physics, & Technology of Wood, 2007, Vol 61, Issue 3, p326
- ISSN
0018-3830
- Publication type
Article
- DOI
10.1515/HF.2007.045