1. Julius Kühn-Institute, Federal Research Centre for Cultivated Plants, Institute for Biological Control, Dossenheim, Germany
2. Agroscope, Research Group Extension Arable Crops, Zurich, Switzerland
3. Julius Kühn-Institute, Federal Research Centre for Cultivated Plants, Institute for Plant Protection in Field Crops and Grassland, Braunschweig, Germany
4. Department Biology, Technical University Darmstadt, Darmstadt, Germany