1. Department of Plant Pathology; Washington State University; Pullman WA 99164 USA
2. Department of Bioagricultural Sciences and Pest Management; Colorado State University; Ft. Collins CO 80523 USA
3. Department of Plant and Environmental Sciences; New Mexico State University; Las Cruces NM 88003 USA
4. USDA-ARS and Department of Horticulture; University of Wisconsin; Madison WI 53706 USA