Laboratory decay tests were carried out with isothiazolone (4,5-dichloro-2-n-octyl-4-isothiazolone-3-one) treated wood. This compound was found to be extremely effective against three common wood decaying brown-rot fungi, exhibiting toxic threshold values in the range of 0.37 to 0.50 kg/m³. For the white-rot fungus, Coriolus versicolor, the toxic threshold values for treated pine and sweetgum were 0.42 and 2.3 kg/m³, respectively. In an unsterile soil test (soft-rot fungi), a toxic threshold value of 0.48 kg/m³ was obtained, which indicates a high degree of effectiveness against these fungi.

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