In this study we investigated the efficacy and impact on the environment of different co-biocide triazoles in wood preservatives. Four different formulations (all containing 9.5% Copper) contained individual and combinations of cyproconazole, tebuconazole, propiconazole as co-biocides. Four formulations were tested according to EN 113 and EN 84 (ageing) to determine the brv for each formulation. To further demonstrate the environmental impact, a CEN/TS 15119-2 laboratory leaching study was performed for each product; the retention corresponding to the previously determined biological reference value, brv. Significantly, cyproconazole produced the lowest brv of the individual and combination of co-biocides tested. Furthermore, from an environmental perspective copper leaching from the copper:cyproconazole product was half that of the copper:propiconazole formulation tested. This significant and positive finding for the efficacy and environmental impact of cyproconazole will be discussed.

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