The benefits from acetylation of wood to enhance resistance against fungal decay and dimensional stability have been known for many years. Since 2007 Accsys Technologies has been commercially producing Accoya® wood that is based on acetylation of radiata pine. A number of studies on the resistance of acetylated wood to attack by wood destroying termites have been conducted, but there is no common understanding of why termite attack on highly acetylated wood is limited. Additional work has been carried out to investigate the termite and insect resistance of Accoya radiata pine. A choice-test and a no-choice-test (force feeding) with Reticulitermes flavipes has been done according to a modified EN 117 and EN 118. In addition the results of a force feeding test with longhorn beetle (Hylotrupes bajulus) larvae in accordance with EN 46 are presented in this paper. The results are compared with previous studies and discussion is initiated on “mode of action”.

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