Identification of Potato Yellow Dwarf Virus Occurring Naturally in California. B. W. Falk, Postgraduate Research Plant Pathologist, Department of Plant Pathology, University of California, Riverside 92521. L. G. Weathers, Professor, and F. C. Greer, Staff Research Associate, Department of Plant Pathology, University of California, Riverside 92521. Plant Dis. 65:81-83. Copyright 1981 American Phytopathological Society. DOI: 10.1094/PD-65-81.

Potato yellow dwarf virus (PYDV) was isolated from naturally infected periwinkle (Vinca rosea) in California. Electron microscopy of infected tissues and of purified virus preparations from infected plants showed virus particles typical of plant rhabdoviruses. California PYDV reacted strongly with antiserum to the New York isolate of PYDV. This is the first report of a PYDV in the western United States.