Cucurbit Genetics Cooperative Report 7:80 (article
Further occurrence of Zucchini Yellow Mosaic Virus in the United
Provvidenti, R. and D. Gonsalves
New York State Agricultural Experiment Station, Cornell
University, Geneva, NY 14456
Joseph Harris Company, Inc., Rochester, NY 14624
During 1983 zucchini yellow mosaic virus (ZYMV) occurred in
cucurbits grown in New York, Florida and California. In affected
fields the virus caused severe losses in fruit production.
It appears that at least two strains of ZYMV are present in the
United States. The first strain designated ZYMV-CT was found to
infect squash in northern Connecticut in 1982 (3) and was
subsequently isolated from squash specimens collected in the fall
of the same year at Homestead, FL. This strain causes very
severe yellow mosaic, knobbed fruits and plant stunting. These
symptoms closely resemble those described for the European
isolate of the virus (1,2). The second strain (ZYMV-FL) was
originally isolated from squash growing in central Florida in the
winter of 1982-83, and subsequently in 1983 from cucurbits grown
in western New York and central California. ZYMV-FL incited
symptoms that could be easily confused with those of watermelon
mosaic virus 1 (WMV-1) infection. Foliage symptoms are also
severe but they lack the intense yellowing caused by ZYMV-CT.
However, plants are also stunted and fruits are knobbed. Both
strains have the same host range and serologically are
indistinguishable, but the incubation period of ZYMV-FL is 3-5
days longer. An antiserum was prepared to cytoplasmic inclusion
proteins (CIP) of ZYMV-CT. This antiserum reacts with the
American and foreign isolates of ZYMV, but not with the CIP of
WMV-1 or WMV-2.
The destructive epidemics caused by ZYMV, here and abroad,
illustrate the economic importance of this virus. Thus, our
activity has been directed toward the search for sources of
resistance or tolerance in cucurbit species. Utilizing hundreds
of domestic and foreign cultivars, it has been established that,
although rare, resistance or tolerance occurs in a few accessions
of Citrullus colocynthis. Cucumis melo, Cucumis
sativus, Cucurbita ecuadorensis, C. maxima and Lagenaria siceraria.
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characterisation d'un potyvirus provoquant la maladie du
rabougrissement jaune du melon. Agronomie 1:827-834.
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D'Aquino. 1981. Characterization of a potyvirus that causes
zucchini yellow mosaic virus. Phytopathology 71:667-672.
- Provvidenti, R., D. Gonsalves, and H. S. Humaydan. 1983.
Occurrence of zucchini yellow mosaic virus in the United States.
Cucurbit Genetics Coop. Rept. 6:99.