The final results from Australia’s largest preservative in-ground stake trial are listed. There were eight test sites, six in Australia and two in Papua New Guinea. The preservatives tested include low and high temperature creosotes, PCP and various water-borne preservatives including CCA and copper chromate. The main timbers examined were sawn Pinus radiata sapwood, sawn Eucalyptus regnans heartwood, and E. regnans natural rounds (mainly sapwood). The number of treatments (preservative/retention/timber combinations) tested was 208, although not at every site. The 15 to 16 year inspection results are provided in an appendix for Taree (NSW), O’Shannassy (Vic), Keravat (PNG), Brown River (PNG), Millaroo (Qld), Innisfail (Qld), Sydney (Pennant Hills, NSW) and Walpeup (Vic). Mean ratings, and median specimen lives, are also provided for the latter three test sites after 39.3-41.8 years’ exposure.

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