Chlorothalonil is a commercially important fungicide with many industrial and agricultural applications. It has a very low mammalian toxicity and is considered to be an environmentally benign material. This paper describes the laboratory evaluation of chlorothalonil as a wood antisapstain treatment. Chlorothalonil was tested as three formulation types - an emulsifiable concentrate (EC), a water-based flowable, and a micromilled (small particle size) flowable. In general, the EC had the best performance against surface growth of mold, stain, and Basidiomycete fungi. The activity of chlorothalonil against mold and stain fungi could be significantly enhanced by the incorporation of an additional fungicide. Copper-8-quinolinolate and diiodomethyl-p-tolylsulfone performed particularly well as complementary fungicides. Chlorothalonil was very effective by itself in controlling surface growth of Basidiomycetes. The chlorothalonil EC formulation performed better than or equal to sodium pentachlorophenate, except against the mold fungi, where the NaPCP was somewhat more effective at lower concentrations.

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