1. USDA, ARS, Crop Improvement and Protection Research Unit, Salinas, CA
2. USDA, APHIS, PPQ, Center for Plant Health Science and Technology (CPHST), Beltsville Laboratory, MD
3. Department of Plant Sciences and Landscape Architecture, University of Maryland, College Park, MD
4. Department of Plant Pathology, NC State University, Mountain Hort. Crops Research & Extension Center, Mills River, NC