In 1996, several institutes conducted laboratory bioassays on the efficacy of unleached Pinus radiata specimens treated with copper-chromium-arsenic (CCA) and copper naphthenate (Cu Naph) at retentions of 0.5, 1.0, 2.0 and 4.0 kg/m3 (total salt for CCA; elemental copper for Cu Naph) against a range of species of subterranean termites (IRG/WP/96-10174). Each participant employed the standard test method of his or her respective laboratory or country. Results demonstrated that the retentions of preservatives tested were too high, thereby preventing meaningful comparison of the various test methods. Consequently, it was decided to undertake a laboratory bioassay in Australia in an attempt to establish the protection threshold limits for unleached CCA-treated P. radiata specimens prior to advancing to the next stage of the collaborative study. This paper presents the results on the efficacy of unleached P. radiata specimens impregnated with CCA at retentions of 0.125, 0.25 and 0.5 kg/m3 (total salt) to attack by two species of subterranean termites, Mastotermes darwiniensis and Coptotermes acinaciformis.

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