Occurrence of Zucchini Yellow Mosaic Virus in Cucurbits from Connecticut, New York, Florida, and California. R. Provvidenti, Department of Plant Pathology, Cornell University, New York State Agricultural Experiment Station, Geneva 14456. D. Gonsalves, Department of Plant Pathology, Cornell University, New York State Agricultural Experiment Station, Geneva 14456; and H. S. Humaydan, Joseph Harris Company, Inc., Rochester, NY 14624. Plant Dis. 68:443-446. Accepted for publication 13 January 1984. Copyright 1984 The American Phytopathological Society. DOI: 10.1094/PD-68-443.

Zucchini yellow mosaic virus (ZYMV) was found infecting cucurbits in some areas of Connecticut, New York, Florida, and California during the growing seasons of 1982 and 1983. It was also recovered from mottled cucumber fruits sold in supermarkets of Geneva, NY, during the winter of 1982–1983. Two strains of this virus were recognized, ZYMV-CT and ZYMV-FL. The first strain incited symptoms resembling those described for the French and Italian isolates of the virus, whereas the second caused symptoms that could be attributed to watermelon mosaic virus 1 (WMV-1). However, both ZYMV strains appeared to have the same host range and were serologically indistinguishable. An antiserum to cytoplasmic inclusion proteins of ZYMV-CT reacted with various isolates of ZYMV but not with those of WMV-1 and WMV-2. Sources of resistance or tolerance to both American strains of ZYMV were found in accessions of Citrullus colocynthis, Cucurbita spp., Cucumis sativus, Cucumis melo, and Lagenaria siceraria.