Bifenthrin has been further tested against wood destroying insects, and its behaviour in wood has been extensively studied. Bifenthrin proved to be highly effective as a curative and preventative treatment against Anobium punctatum and Hylotrupes bajulus, after both leaching and evaporative ageing. Results of penetration tests with water and solvent based formulations, applied by brushing, dipping and double vacuum confirmed the good performance of bifenthrin in wood of Scots pine and beech. The new results confirm the promising characteristics of bifenthrin as highly effective and stable insecticidal wood preservative.