The ability of selected wood preservative to protect southern pine sapwood against marine borer attack was evaluated over a 6 year period in Yaquina Bay, Oregon. The site exposed the wood to potential attack by both Teredo navalis and Limnoria spp. Both creosote and CCA provided excellent protection at moderate retentions, while ACQ produced slight differences in performance depending on the copper to quat ratio. Copper naphthenate provided poor protection, while ACZA was intermediate in its ability to resist attack at lower retention levels. A wood/plastic composite provided good protection for the first 5 years, but has now begun to experience Limnoria attack.

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