Isothiazolones (I.T.A.'s) are a class of biocides that have potential for use as wood preservatives. The substituted ITA, RH-287, (4,5,dichloro-2-n-octyl-isothiazolone-3-one) is being evaluated as a broad spectrum wood preservative. The evaluation program includes in ground stake tests which were established at two test sites in Mississippi, USA The tests used southern yellow pine treated with RH-287 in accordance with AWPA Standard M7. Five year inspection data have revealed excellent performance by stakes treated with 2 kg/m³ RH-287 in an oil carrier solvent. At this treatment level stakes were protected from termite attack and fungal decay. These results indicate that RH-287 offers excellent potential for use as an in ground contact wood preservative

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