A compilation is made of results published by various workers for agar/block laboratory tests of the effectiveness of wood preservatives against 11 species of wood destroying Basidiomycetes and one species of soft rot fungus. Preservatives include creosote, boron, metal/arsenic mixtures, metallic naphthenates, chlorinated naphthalene, chlorinated phenols and tri-n-butyl tin oxide. The results are compared statistically and the causes of the variance between different estimates examined. The limitations of agar/block and other laboratory tests as predictors of performance in the evaluation of preservatives are discussed.

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