The aim of the project was to determine whether harmful organisms related to wood would be killed by kiln drying processes according to the requirements of the EU-Directive 2000/29/EC. The reduction of the moisture content to less than 20 % should be carried out using different temperature regimes. Results were aimed to clarify whether the phytosanitary effect of a K.D. treatment is achieved by desiccation of the wood to make it unsuitable as host resource for e.g. insects, or the thermal effects on the target organisms.