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Fenoxycarb is an insecticide that can be used at very low concentrations in wood preservatives because of its hormon-like activity. As a consequence relatively low concentrations of fenoxycarb have to be determined in extracts of treated timber containing a background of wood extractives. It was demonstrated in parallel analyses in different laboratories that fenoxycarb can efficiently be extracted from treated wood by methanol and can be determined in the extracts by high performance liquid chromatography coupled with UV detection. However, fenoxycarb concentrations at the lower level of required retentions can only be determined according to the tested procedure with further sample preparation. The deviation of the results between the laboratories is relatively large caused by difficulties in the interpretation of the chromatograms