16 chemicals or formulations, 15 of which were water-soluble solutions or water-dispersible emulsions, were evaluated as potential substitutes for pentachlorophenol in diesel oil, which is sprayed on untreated western redcedar poles in service to control sapwood decay. Appraisals were made through trials on wood blocks treated in the laboratory and on poles treated in the field. Quantitative comparisons were made by determining weight losses among treated and untreated blocks exposed to a decay fungus and by <i>Aspergillus</i> bioassays. Several waterborne formulations were promising. -- AATA