The performance of field test stakes derived from commercially produced ground contact retention copper quat preservatives based on either soluble copper complexed with ethanolamine, or from a water-based suspension of particulate micronized copper compounds, as well as untreated southern yellow pine controls, is compared at two decay test sites. After less than one year in field test some of the untreated controls at both test sites showed severe fungal deterioration. Stakes treated with the soluble copper preservative are unattacked, while those treated with the particulate micronized copper preservative are showing varying degrees of decay, which in some cases is severe or complete. Possible reasons for the performance differences observed are discussed.

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