1. Department of Botany and Plant Pathology, Purdue University, West Lafayette, IN 47907, USA
2. Department of Plant Pathology, Iowa State University, Ames, IA 50011, USA
3. Departments of Entomology and Plant Pathology, University of Wisconsin, Madison, WI 53706, USA
4. Department of Plant Pathology, University of Kentucky, Princeton, KY 42445, USA
5. Department of Entomology and Plant Pathology, Auburn University, Auburn, AL 36849, USA
6. Department of Plant and Soil Science, University of Delaware, Newark, DE 19716, USA