1. Department of Plant and Soil Sciences, University of Kentucky, Lexington, Kentucky 40546 (H.Z.); Department of Plant Pathology, University of California, Davis, California 95616 (H.-K.C., D.R.C.); and Corn Insect and Crop Genetics Research Unit, United States Department of Agriculture, Agricultural Research Service, Iowa State University, Ames, Iowa 50011 (R.C.S.)