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Resistance of Sweet Sorghum Cultivars and Lines to Maize Dwarf Mosaic in Kentucky, Ohio, and Mississippi. N. Zummo, Research Plant Pathologist, U.S. Department of Agriculture, Science and Education Administration, Agricultural Research, U.S. Sugar Crops Field Station, Meridian, MS 39301. W. R. Findley, Research Agronomist, USDA, SEA-AR, Ohio Agricultural Research & Development Center, Wooster 44691; K. C. Freeman, Research Agronomist, USDA, SEA-AR, U.S. Sugar Crops Field Station, Meridian, MS 39301; M. J. Bitzer, Extension Specialist, University of Kentucky, Lexington 40506; and G. Armstrong, Superintendent, Robinson Substation, Quicksand, KY 41363. Plant Dis. 65:241-242. . This article is in the public domain and not copyrightable. It may be freely reprinted with customary crediting of the source. The American Phytopathological Society, 1981. DOI: 10.1094/PD-65-241.

Sweet sorghum lines MN 960, Mer. 75-6, Mer. 76-1, Mer. 77-2, and Mer. 77-7 showed good levels of resistance to maize dwarf mosaic in the field over 10 yr when susceptible control varieties had more than 90% infection. However, when MN 960 was inoculated mechanically in the greenhouse with five strains of sugarcane mosaic virus, 70% of the inoculated plants became infected. Mer. lines 75-6, 76-1, 77-2, and 77-7 are all unreleased breeding lines with Brandes as one common parent.