The efficacy of various micronized and amine copper preservative systems was evaluated using soil block testing with the copper tolerant brown rot fungi, Postia placenta. The American Wood Protection Association E22 protocol was used to compare the relative efficacy of preservatives by monitoring compressive strength losses of the systems in southern pine wood. As information, the weight losses were also measured and the relative ranking of the systems was the same by either methodology. Generally, the micronized and amine systems with co-biocides performed very well while systems without a cobiocide did not. Used treating liquids obtained from operating plants did not show any significant differences in performance compared to virgin liquids of the same system.

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