Performance of chlorothalonil and chlorothalonil/biocide combinations in anti-sapstain tests

Chlorothalonil (CTL) 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 CTL as a wood anti-sapstain treatment. CTL was tested as three formulation types: an emulsifiable concentrate (CTL 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 decay fungi. The activity of CTL 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. CTL was very effective by itself in controlling decay fungi. The EC formulation of CTL performed equal to, or better than, the control treatments (sodium pentachlorophenate (NaPCP) and NP-1), except against the mold fungi, where the NaPCP was somewhat more effective at lower concentrations.

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