Small size stakes of Eucalyptus maculata and Pinus elliottii were treated with CCA to various retentions and embedded in concrete collars containing varying amounts of a fungicide additive. During the 30 month trial period stakes were removed after 12, 18, 24 and 30 months and assessed for residual strength. Stakes which showed significant strength reductions were microscopically examined for the presence and extent of decay. The results obtained suggest that concrete collars provide a stable environment suitable for microbial activity and that the addition of a fungicide will provide protection within the concrete collar. Never-the-less decay is likely to occur outside the levels of the concrete collar especially with treated hardwoods which are recognised as being susceptible to soft rot decay.

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