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Variation in Transmission of an Isolate of Barley Yellow Dwarf Virus by Rhopalosiphum padi. R. D. Price, Visiting Fellow, Plant Science Research Division, ARS, USDA, Cornell University, Ithaca, New York 14850, Present address of senior author: Victorian Plant Research Institute, Swan St., Burnley 3121, Victoria, Australia; Irmgard Muller(2), and W. F. Rochow(3). (2)(3)Research Technician, and Research Plant Pathologist, Plant Science Research Division, ARS, USDA, and Professor of Plant Pathology, respectively, Cornell University, Ithaca, New York 14850. Phytopathology 61:753-754. DOI: 10.1094/Phyto-61-753.

Progeny of individual Rhopalosiphum padi that had effected an occasional transmission of the MAV isolate of barley yellow dwarf virus were no more likely to transmit MAV in subsequent tests than were progeny of individuals that originally failed to transmit the virus. Such occasional loss of specificity in the virus-aphid relationship does not appear to the based on genetic variation within the colony of R. padi.

Additional keywords: aphid transmission of virus, Macrosiphum avenae, aphid clones.