1. Department of Environmental Horticulture (A.M.B., P.A.O.), and Section of Plant Biology (T.M.M.), University of California, Davis, California 95616; USDA-ARS, Department of Plant Pathology, Washington State University, Pullman, Washington 99164–6430 (P.A.O.); Department of Botany, University of Wisconsin, Madison, Wisconsin 53706 (K.R.J.); Biology Department, Ithaca College, Ithaca, New York 1485