Abstract
Requests for specific strains of California grapevine viruses, virus and virus-like diseases as well as for specific indicator strains of cultivars are constantly received from various research laboratories over the world for use in research, comparative studies, and teaching. The old Davis virus and virus-like disease collection of own-rooted grapevines established in the 1960s had been degenerating due to phylloxera. A new expanded collection has been established as own-rooted plants and also in graft-inoculated cultivars on rootstocks. Each entry in the new collection has a designated number consisting of descriptive letters and numerals (like GFLV-100). New entries have been and will continue to be accepted. Collections of grapevines are pools of reference and source materials of standard type cultivars of viruses, virus and virus-like diseases. There are three additional collections of grapevines on the UCD campus, each of which serves a different purpose: the Department of Viticulture and Enology collection, the UCD Foundation Plant Materials Services collection of indexed and registered cultivars, and the United States Department of Agriculture - Agricultural Research Services (USDA-ARS) National Clonal Germplasm Repository collection.
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