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Disease Note. First Report of Zucchini Yellow Mosaic Virus in Singapore. S. M. Wong, Botany Department, National University of Singapore, Kent Ridge, Singapore 0511. S. C. Lee, and J. S. Loi. Botany Department, National University of Singapore, Kent Ridge, Singapore 0511, and Sembawang Agricultural Experiment Station, Primary Production Department, Republic of Singapore. Plant Dis. 76:972. Accepted for publication 20 April 1992. Copyright 1992 The American Phytopathological Society. DOI: 10.1094/PD-76-0972B. Flexuous rod particles of 11 × 800 nm were isolated from cucumber
(Cucumis sativus L.) from a commercial hydroponic farm in Sembawang,
Singapore, in 1989. Affected plants showed leaf yellow mosaic,
severe fruit distortion, and stunting. Both flexuous rods and cytoplasmic
inclusion protein were observed by transmission electron
microscopy in crude leaf sap from diseased plants. The virus was
isolated and identified by electron microscopy as zucchini yellow
mosaic virus (ZYMV). Host ranges included Citrullus lanatus (Thunb.)
Matsum. & Nakai, Cucumis melo L., C. sativus, Cucurbita pepo L.,
Luffa acutangula (L.) Roxb., and L. cylindrica Roxb. The isolate
did not infect Momordica charantia L. or Trichosanthes anguina L.
Results of indirect ELISA were positive when the mosaic cucumber
leaves were tested with known ZYMV virions and ZYMV cytoplasmic
inclusion protein antisera. This is the first report of ZYMV from
Singapore. |