Protection of western redcedar pole sapwood by spray treatments

The ability of 30 oilborne and waterborne biocides to protect western redcedar (Thuja plicata Donn ex D. Don) sapwood from aboveground decay was assessed in pole sections and small blocks exposed on a test fence over 2- to 11-year periods. Many chemicals provided protection for the first 2 years, but this protection declined rapidly thereafter, unlike that provided by pentachlorophenol, the chemical previously used for this application. Kathon 930, TBTO, and several other chemicals protected small blocks exposed for 5 years under severe leaching; these chemicals appear appropriate for such applications. In addition, several others provided slightly lower degrees of protection and might be appropriate if retreatments were made at intervals shorter than the current 10 to 15 years.

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