1. Department of Plant Pathology, University of Kentucky, Princeton, KY 42445, U.S.A.
2. Departamento de Fitopatologia, Universidade Federal de Viçosa, Viçosa 36570-000, Brazil
3. Department of Entomology and Plant Pathology, University of Tennessee, Jackson, TN 38301, U.S.A.
4. Division of Plant Sciences, University of Missouri, Columbia, MO 65201, U.S.A.
5. Department of Botany and Plant Pathology, Purdue University, West Lafayette, IN 47907, U.S.A.
6. Department of Crop Sciences, University of Illinois, Urbana, IL 61801, U.S.A.