Extensive investigations have been conducted in recent years on the performance of chlorothalonil (tetrachloroisophthalonitrile) as a ground contact wood preservative. Efficacy information is presented on a soil block test with 11 Basidiomycetes, a fungus cellar evaluation, above-ground field testing against termites in Australia and Hawaii, and ground-contact field stakes installed in Florida (9 years), Hawaii (5 years), and Mississippi (7 and 8 years). In general, chlorothalonil performed better than or equally to pentachlorophenol, which was usually used as a control treatment. Wood treated with chlorothalonil formulated in an AWPA P9 Type A oil was more resistant to water leaching that pentachlorophenol in diesel/KB3 carrier.

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