Young, Harry C., Jr.Kumphai, Siripong2015-10-052015-10-051983-12https://hdl.handle.net/20.500.14446/19376application/pdfCopyright is held by the author who has granted the Oklahoma State University Library the non-exclusive right to share this material in its institutional repository. Contact Digital Library Services at lib-dls@okstate.edu or 405-744-9161 for the permission policy on the use, reproduction or distribution of this material.Use of host resistance genes in the field, radiation, and a chemical mutagen to identify or change the virulence spectrum of the leaf rust pathogen Puccinia recondita Rob. ex. Desm. f. sp. TriticiDissertation