1. Central Institute for Decision Support Systems in Crop Protection, Rüdesheimer Str. 60-68, D-55545 Bad Kreuznach, Germany
2. Department of Biogeography, Faculty of Regional and Environmental Sciences, Trier University, Universitätsring 15, D-54286 Trier, Germany
3. Section of Ecological Plant Protection, Faculty of Organic Agricultural Sciences, University of Kassel, Nordbahnhofstr. 1a, D-37213 Witzenhausen, Germany