The sapwood of two Lyctus susceptible Australian hardwoods, messmate (Eucalyptus obliqua L'Herit.) and black bean (Castanospermum australe A. Cunn. et Fraser ex Hook) were pressure impregnated with ACQ2100, a wood preservative, to produce replicates of a range of retentions. Preservative retentions were determined by solution weight uptake at treatment and chemical analyses of selected samples was attempted. After post treatment seasoning, timber specimens were exposed to fresh adult Lyctus (Stephens) beetles and allowed to stand in an environment controlled insectary. After 1.5 times the life cycle time for the insects in control specimens, the trial was evaluated for Lyctus activity. A table of preservative retentions and insect activity is provided. A toxic level of ACQ2100 for Lyctus is proposed.

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