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Distribution of Maize Dwarf Mosaic and Aphid Vectors in Ohio. J. K. Knoke, Research Entomologist, ARS, USDA, and Adjunct Associate Professor, Department of Entomology, Ohio Agricultural Research and Development Center, Wooster 44691; Raymond Louie(2), R. J. Anderson(3), and D. T. Gordon(4). (2)Research Plant Pathologist, ARS, USDA, and Adjunct Associate Professor, Department of Plant Pathology, Ohio Agricultural Research and Development Center, Wooster 44691; (3)Entomologist ARS, USDA, Ohio Agricultural Research and Development Center, Wooster 44691; (4)Associate Professor, Department of Plant Pathology, Ohio Agricultural Research and Development Center, Wooster 44691. Phytopathology 64:639-645. Accepted for publication 15 November 1973. DOI: 10.1094/Phyto-64-639.

A survey of commercial corn fields and corn seedling trap plants revealed that maize dwarf mosaic (MDM) is most prevalent in southern Ohio from mid-July through mid-September. During this period, at sites where virus-infected source plants are present, increases in aphid populations result in corresponding increases in MDMV transmission. Most MDM in Ohio results from strain A. MDM rarely occurs in the northwestern Corn Belt area of Ohio.