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Disease Note. First Report of Zucchini Yellow Mosaic Virus in Cucurbita pepo in the Pacific Northwest. J. M. Crosslin, Irrigated Agriculture Research and Extension Center (IAREC), Washington State University, Prosser 99350. J. K. Brown, and D. A. Johnson. Department of Plant Pathology, University of Arizona, Tucson 85721; and IAREC. Plant Dis. 72:362. Accepted for publication 18 November 1987. Copyright 1988 The American Phytopathological Society. DOI: 10.1094/PD-72-0362A.
Zucchini yellow mosaic virus (ZYMV) causes disease in many
cucurbit species and has been reported from Europe, North Africa,
and Israel and also from several states in most regions of the United
States (1) except the Pacific Northwest. In August 1986, zucchini
squash (Cucurbita pepo L. var. melopepo Alef.) plants in many
commercial fields (approximately 40% of 102 ha affected) near Walla
Walla, Washington, showed mosaic and leaf deformation and produced
mottled, irregularly shaped, unmarketable fruit. Results of mechanical
inoculation to 14 host species and electron microscopic observations of
long, flexuous viruslike particles in plant sap suggested the involvement
of one or more potyviruses. Agar gel double-diffusion results with
antisera against papaya ringspot virus-W (PRSV-W, previously
watermelon mosaic virus-1), watermelon mosaic virus-2 (WMV -2), and
ZYMV indicated plants were infected with ZYMV or with both WMV-2 and ZYMV. PRSV-W was not detected in any sample in these tests.
On the basis of host range, symptomatology, electron microscopy, and
serological data, ZYMV is present in the Pacific Northwest and poses a
potentially serious threat to cucurbit production in that area.
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