Winged Bean Mosaic Caused by Clover Yellow Vein Virus. M. Fox, Graduate Assistant, Department of Botany, University of Maryland, College Park 20742. M. K. Corbett, Professor, Department of Botany, University of Maryland, College Park 20742. Plant Dis. 69:352-354. Accepted for publication 20 December 1984. Copyright 1985 The American Phytopathological Society. DOI: 10.1094/PD-69-352.

Winged bean (Psophocarpus tetragonolobus) plants from experimental field plots in eastern Maryland were stunted and showed leaf mosaic and rugosity. Electron microscopy of leaf-dip preparations from symptomatic tissue showed flexuous rod viruslike particles about 750 nm long. The virus was mechanically transmissible, and purified preparations induced symptoms in winged beans identical to those in the original diseased plants. Vector relationships, inclusion characteristics, physical properties, and density-gradient analysis indicated the virus was a member of the potyvirus group. Serological gel double-diffusion tests of sodium dodecyl sulfate-treated preparations showed this pathogen was an isolate of clover yellow vein virus.