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Properties of Tobacco Vein-Mottling Virus, a New Pathogen of Tobacco. M. K. C. Sun, Postdoctoral Fellow, North Carolina State University, Raleigh 27607, Present address: The Asian Vegetable Research and Development Center, P.O. Box 42, Shanhua, Tainan, Taiwan, R.O.C; G. V. Gooding, Jr.(2), T. P. Pirone(3), and Sue A. Tolin(4). (2)Professor, North Carolina State University, Raleigh 27607; (3)Professor, University of Kentucky, Lexington 40505; (4)Associate Professor, Virginia Polytechnic Institute and State University, Blacksburg, Va. 24061. Phytopathology 64:1133-1136. Accepted for publication 23 March 1974. DOI: 10.1094/Phyto-64-1133.

A virus which causes veinbanding symptoms on burley tobacco was purified and characterized. Inactivation properties from Nicotiana tabacum 'Burley 21' were: (i) dilution end point between 10^–2 and 10^–3, (ii) thermal inactivation point 60-70 C and (iii) aging in vitro 1-2 days. Flexuous particles approximately 13 × 765 nm and pinwheel inclusions were observed in infected Burley 21 plants. Based on symptomatology and host range studies, the virus differs from other members of the potato virus Y (PVY) group. It is not serologically related to other viruses in the PVY group commonly found on tobacco. Tobacco vein-mottling virus is proposed as the name for this virus.