Abstract: Wireworms tunneling into potato tubers cause quality decline to the product. Due tothe short time between initial wireworm presence in the topsoil in spring and the moment ofpotato planting, decisions whether or not to control wireworms based on monitoring in spring areinsecure. Increased knowledge on temperature and soil moisture may help enhance a succesfulmonitoring strategy. Two trials performed in climate chambers showed wireworms to beincreasingly active between 5°C and 25°C. The preferent soil moisture level was 20%, rangingfrom 10 to 25%.