Ramin treated with copper-chrome-arsenic (CCA), pentachlorophenate and lindane, each at three retentions, and three other untreated timbers were assessed in the field against Coptotermes lacteus and Nasutitermes exitiosus. Replicate specimens were exposed around five mounds of each termite species over a period of five years in south-eastern Australia. The field results provided the basis for judgement of corresponding laboratory trials conducted accordingly to the standard procedures of Europe, U.S.A. and Australia. In the field none of the wood preservative treatments with-stood termite attack for the full period of five years, not even CCA at the highest retention of 2.3 kg/m³. Merbau and Jarrah were the most resistant timbers but there was noticeable variation between trees.

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