School of Ecosystem and Forest Sciences - Theses

Permanent URI for this collection

Search Results

Now showing 1 - 1 of 1
  • Item
    Thumbnail Image
    The effects of boron-treated timbers against coptotermes species in Australia
    Ahmed, Berhan Mahmoud ( 2000-12)
    In Australia the protection of building timbers from termites relied for many years upon the application of persistent organochlorines as well as the organophosphate compound (chlorpyrifos) and the synthetic pyrethroid (bifenthrin) as soil chemical barriers (Lenz et al. 1990; Watson, 1990; NHMRC, 1992; AS 3660.1 1995). The persistent organochlorines have been banned since 1987 in the USA and from June 1995 in all Australian states except the Northern Territory. The study evaluated the life-cycle of boron as an alternative wood preservative, its toxicity to foraging populations of subterranean termites (‘termites’) over time were particularly referred to the influence of foraging space and determined a suitable loading of boron in timber for hazard class2 (H2) conditions as defined in Australian standard-1997. Preservative treatment of timber according to Australian Standard 1604 (1997) prevents attack and damage of wood and wood products from biodeteriogens (namely fungi and insects). Above-ground interior timber framings are not normally liable to decay but to damage by wood-destroying insects. The study examined the use of borates as wood preservatives to prevent attack and damage by subterranean termites (‘termites’) of the genus of Coptotermes. In addressing the aims of this study, several different avenues of approach were followed. The chapter sequence in this thesis follows the pattern of measuring the effects of borates on a wide range from 20 termites in laboratory bioassay to thousands of termites in natural colonies.