Assessment of untreated Papua New Guinea timbers for resistance to subterranean termites.
Eight major commercial timbers (Intsia palembanica, kwila; Pometia pinnata, taun; Homalium foetidum, malas; Dracontemelon [Dracontomelon] dao, PNG walnut; Calophyllum spp.; Eucalyptus deglupta, kamarere; Nothofagus spp., PNG beech; and Alstonia scholaris, white cheesewood) were exposed in ground contact against subterranean termites, by embedding 5 replicates of heartwood stakes (25×25×250 mm) of each species randomly in the soil at a site near the PNG University of Technology Forest Department in September 1987. Results after 24 months exposure showed that kwila was still sound while taun, PNG walnut, malas and white cheesewood had traces of termite attack on some stakes. All stakes of Calophyllum and PNG beech were totally destroyed while three of the kamarere stakes were also destroyed. The termites found attacking the stakes were Nasutitermes graveolus, Coptotermes obiratus, Coptotermes acinaciformes [C. acinaciformis] and Microcerotermes repugnans.