1. Department of Entomology (J.L., S.B., S.V.) and Department of Biochemistry (J.L.), University of Nebraska, Lincoln, Nebraska 68583; Department of Plant Science (L.C.-D., V.J., D.S.L.) and Department of Entomology (G.W.F.), Pennsylvania State University, University Park, Pennsylvania 16802; and United States Department of Agriculture-Agricultural Research Service, Corn Host Plant Resistance Research Unit (W.P.W.), Mississippi State, Mississippi 39762