Organoiodine compounds which have been commercialized these years in Japan poorly performed as fungicides in the amended JWPA decay test (Standard 1, 1989) when applied to superficial treatment of timber. Because some parts of active ingredients seemed to disappear from the treated timber surface mainly due to the severe leaching cycles. This was prominently true for beech (Fagus crenata Blume) sapwood against a white-rot fungus Coriolus versicolor (L. ex Fr.) Quel. At the highest test concentration of 3% only copper naphthenate could meet the efficacy requirement (<3% mean weight loss prescribed in JWPA Standard 7 (1989).

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