1. Department of Entomology Washington State University Pullman Washington 99164 USA
2. Washington State University Extension Ephrata Washington 99823 USA
3. Department of Entomology, Plant Pathology, and Nematology University of Idaho Kimberly Idaho 83844 USA
4. Department of Crop and Soil Science Oregon State University Hermiston Oregon 97838 USA
5. Northwest Potato Research Consortium Lakeview Oregon 97630 USA