1. Department of Entomology, University of Arizona, Tucson, AZ 85750, USA.
2. Waite Institute, University of Adelaide, Glen Osmond 5064, South Australia, Australia
3. Department of Plant Breeding, Cornell University, Ithaca, NY 14853, USA
4. Department of Entomology, Cornell University, New York State Agricultural Experiment Station, Geneva, NY 14456, USA