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Host Reactions of Mechanically Transmissible Legume Viruses of the Northern Temperature Zone. R. Hampton, Members of the International Working Group on Legume Viruses, Research Plant Pathologist, Agricultural Research Service, U.S. Department of Agriculture, Oregon State University, Corvallis, OR 97331; L. Beczner(2), D. Hagedorn(3), L. Bos(4), T. Inouye(5), O. Barnett(6), M. Musil(7), and J. Meiners. (2)Plant Virologist, Research Institute of Plant Protection, Budapest, Hungary; (3)Professor, Department of Plant Pathology, University of Wisconsin, Madison, WI 53706; (4)Virus Research Officer, Institute of Phytopathological Research, Wageningen, The Netherlands; (5)Plant Virologist, College of Agriculture, University of Osaka Prefecture, Sakai, Osaka, 591, Japan; (6)Associate Professor, Department of Plant Pathology and Physiology, Clemson University, Clemson, SC 29631; (7)Plant Virologist, Institute of Virology, Slovak Academy of Sciences, Bratislava 9, Czechoslovakia; (8)Chief, Applied Plant Pathology Laboratory, Agricultural Research Service, U.S. Department of Agriculture, Beltsville, MD 29795. Phytopathology 68:989-997. Accepted for publication 30 December 1977. Copyright 1978 The American Phytopathological Society, 3340 Pilot Knob Road, St. Paul, MN 55121. All rights reserved.. DOI: 10.1094/Phyto-68-989.

Reactions of 23 plant hosts to inoculation with each of 38 legume viruses, and a key to aid in the diagnosis of these viruses, are presented. The virus isolates, investigated at locations where they are indigenous, were either type cultures or had been equivalently characterized. Each of the hosts was derived from standardized seedstocks. Therefore, each investigator tested specific viruses against identical host germplasm. The key is based on some 1,700 symtomatological data and virus host ranges obtained from selected plant hosts. The final key formulation was derived from evaluations of all possible combinations and hierarchies of plant hosts. Assuming that each virus will infect and induce characteristic symptoms when inoculated into defined cultivars under suitable conditions, the key is an aid to identification for each of the 38 viruses tested. Evaluations of two to four separate isolates of certain viruses supported the diagnostic value of the key.