New Diseases and Epidemics Properties of Strains of Potato Virus Y^N in North America. J. G. McDonald, Central Plant Health Laboratory, ADRI, 3851 Fallowfield Rd., Nepean, Ontario K2H 8P9, Canada. G. T. Kristjansson, Central Plant Health Laboratory, ADRI, 3851 Fallowfield Rd., Nepean, Ontario K2H 8P9, Canada. Plant Dis. 77:87-89.. Accepted for publication 30 August 1992. 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, 1993.. DOI: 10.1094/PD-77-0087.

A tobacco veinal necrosis strain of potato virus Y (PVY^N) was detected in tobacco production in Ontario in 1989. Subsequent surveys of potato production in Ontario, Prince Edward Island, New Brunswick, Nova Scotia, and Québec and of table potatoes imported into Canada from California yielded similar isolates of PVY^N. The host range and serological properties of several of these isolates were compared to a PVY^N strain from Scotland and other PVY strains from the United States (PVY-NN, PVY-MN, and PVY-36) that had been reported to cause necrosis in tobacco. These other PVY strains did not belong to the PVY^N strain group, because they did not systemically infect potato cultivars and differed in host range and serological reactions.

Keyword(s): monoclonal antibodies, PVY^O.