1. School of Environmental Sciences; University of Guelph; Guelph Ontario N1G 2W1 Canada
2. Department of Entomology; Michigan State University; 578 Wilson Rd, East Lansing MI 48824 U.S.A.
3. Department of Plant Agriculture; University of Guelph Ridgetown Campus; 120 Main St., Ridgetown Ontario N0P 2C0 Canada
4. Department of Entomology; University of Illinois at Urbana-Champaign; 1816 South Oak Street Champaign, IL 61820 U.S.A.