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Characterization of Peanut Stunt Virus Strains by Host Reactions, Serology, and RNA Patterns. Zeyong Xu, Visiting plant pathologist, Department of Plant Pathology and Physiology, Clemson University, Clemson, SC 29632, First author on leave from the Oil Crops Research Institute of the Chinese Academy of Agricultural Sciences, Wuhan, China; O. W. Barnett(2), and P. B. Gibson(3). (2)Professor, Department of Plant Pathology and Physiology, Clemson University, Clemson, SC 29632; (3)Research agronomist (retired), USDA-ARS, Department of Agronomy, Clemson University, Clemson, SC 29632. Phytopathology 76:390-395. Accepted for publication 21 November 1985. 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, 1986. DOI: 10.1094/Phyto-76-390.

Thirteen peanut stunt virus (PSV) isolates were characterized by host and serological reactions. Reactions in gel diffusion tests were used to separate the isolates into four serotypes: I, II, III, and IV. Isolates of serotype III, a new serotype, infected Davis and Bansei soybean but did not infect peanut or Perfected Wales pea. Isolates in serotypes I, II, and III were closely related serologically but distantly related to serotype IV (PSV-W). All PSV isolates had RNA 1-4 of similar molecular weights. An RNA 5 was found in the two PSV isolates tested in serotypes I, II, and III but not in PSV-W. Relative infectivity of six of the PSV isolates on white clover was determined by inoculating plants of 20 different white clover clones. Infectivity of the six isolates varied among clover clones.