Pinus radiata sapwood stakes 20 x 20 x 400 mm³ were treated with CCA Type C using a range of concentrations and three treatment processes; Bethell, Lowry and Rueping. Preservative retention was determined by chemical analysis of treated material. Following fixation, fungus cellar stakelets, 5 x 10 x 180 mm³ were cut from treated material and after leaching were exposed in unsterile soil beds in the FRI Fungus Cellar. Results after 65 months' exposure indicate that performance was related only to preservative retention. Differences in treatment process had little effect on decay resistance. This is in contrast to results from pure culture decay tests, reported earlier, which indicated that disproportionation of preservative elements using empty cell processes and low preservative concentrations had significant effect on durability.

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