2005 Annual Report 4d.Progress report. This report serves to document research conducted under a non-funded cooperative agreement between ARS and Colorado State University; EPA, National Exposure Research Laboratory, Molecular Ecology Research Branch; Illinois Natural History Survey; INRA (National Institute of Agricultural Research), France; Iowa State University; Justus-Liebig-Universität, Germany; Mississippi State University; Pennsylvania State University; Purdue University; University of Arkansas; University of Guelph, Canada; University of Illinois; University of Maryland; University of Missouri; University of Nebraska; University of Vermont; and University of Wisconsin. Additional details of research can be found in the report for the parent project #3625-22000-015-00D, Ecologically-Based Management of Selected Insects Associated with Corn. Cooperators, involving over 35 scientists from 19 institutions in 3 countries, were organized into a Diabrotica Genetics Consortium to promote collaboration and coordination of research in the broad categories of molecular marker development, population genetics, mapping of important genetic traits, identification of genes, and selection of laboratory lines of corn rootworms in the genus Diabrotica. Participants have contributed to a document in which each outlined research goals, overall strategy and technical approach, anticipated time frame for reaching milestones, current collaborators and their roles, and recent accomplishments and progress. Most of the Consortium members participated in the first International Conference on Diabrotica Genetics, held in Kansas City, MO, December 13-15, 2004, organized by ARS. At this conference, scientists from the U.S., France, and Canada selected four microsatellite DNA markers developed by Unit scientists to comprise a set of universal core markers to be recommended for use in all future population genetics studies of western corn rootworm.