RH 287, a substituted isothiazolone, was evaluated for efficacy against decay fungi in an above ground test in Mississippi. After 45 months of exposure, all test units that were pressure treated with this biocide at levels of 0.026 pcf and higher have no deterioration. In addition, the test units that were dip-treated with a solution concentration of 0.5% also have no deterioration. Compared to penta, RH 287 appears at least 10 times as effective against decay fungi in above-ground exposures. Analytical results from test units exposed for 45 months indicate that RH 287 is stable and does not deplete from the wood.

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