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Characterization of Two Viruses Isolated from Patchouli in Japan. K. T. NATSUAKI, Department of International Agricultural Development, Tokyo University of Agriculture, Setagaya-ku, Tokyo 156. K. TOMARU, NODAI Research Institute, Tokyo University of Agriculture, Setagaya-ku, Tokyo 156; S. USHIKU, Yokohama Plant Protection Station, Naka-ku, Yokohama 231; Y. ICHIKAWA and Y. SUG1MURA, Kao Co., Tochigi Research Laboratories, Ichikai, Tochigi 321-34; and T. NATSUAKI, S. OKUDA, and M. TERANAKA, Utsunomiya University, Mine-machi, Utsunomiya 321, Japan. Plant Dis. 78:1094-1097. Accepted tor publication 18 July 1994. Copyright 1994 The American Phytopathological Society. DOI: 10.1094/PD-78-1094.

Two sap-transmissible viruses were isolated from patchouli (Pogostemon patchouli) in Japan. The virus source plants showed faint mosaic, mottling, or no symptoms. In electron microscopic examinations, however, elongated (760 nm in length) or spherical (27 nm in diameter) viruslike particles were found. The spherical virus, designated patchouli mild mosaic virus (PaMMV), infected plants in seven families and was found to be serologically related to, but different from, broad bean wilt virus. The elongated virus, named patchouli mottle virus (PaMoV), had a narrower host range and was identified as a member of the Potyviridae on the basis of particle morphology, formation of cytoplasmic inclusions, and a distant serological relationship with turnip mosaic potyvirus.