1. Cooperative Extension Service, University of Delaware, Newark 19716
2. Department of Plant Pathology, The Ohio State University, Ohio Agricultural Research and Development Center, Wooster 44691
3. Department of Plant Pathology, Physiology, and Weed Science, Virginia Tech, Tidewater Agricultural Research and Extension Center, Suffolk 23437
4. Department of Plant Pathology and Environmental Microbiology, The Pennsylvania State University, Southeast Agricultural Research & Extension Center, Manheim 17545
5. Department of Plant Pathology, The Ohio State University, Ohio Agricultural Research and Development Center
6. Department of Plant and Soil Sciences, University of Delaware