Abstract
1 Molecular Plant Pathology Laboratory, Agricultural Research Service, U.S. Department of Agriculture, Beltsville, Maryland 20705
2 Department of Microbiology and Immunology, George Washington University, Washington, D.C. 20037
3 Department of Plant and Soil Sciences, University of Delaware, Newark, Delaware 19717
4 IFAS, REC, University of Florida, Ft. Lauderdale, Florida 33314
5 Department of Plant Pathology, University of Georgia, Athens, Georgia 30223-1797