1. Department of Entomology; Rutgers University; New Brunswick NJ 08901 USA
2. Swedish University of Agricultural Sciences; SE-75007 Uppsala Sweden
3. Department of Entomology; Cornell University; Ithaca NY 14853 USA
4. Department of Entomology; Michigan State University; East Lansing MI 48824 USA
5. Department of Horticulture; Cornell University; Ithaca NY 14853 USA
6. Department of Ecology; Evolution and Natural Resources; Rutgers University; New Brunswick NJ 08901 USA