Species: V. rupestris
Country of origin: France
Pedigree: V. rupestris
Berry color: None
Use(s): Rootstock St. George is also known as Rupestris du lot and has a long history in California where it has typically been used in dry-farmed vineyards. St. George seems to avoid drought because of its deep, extensive root system, and does not perform well on shallow soils with limited water. It is a high vigor rootstock with generally low-yield:pruning weight ratios, primarily a function of reduced fruit set. Use of St. George should be avoided with small-clustered or loose-clustered varieties on fertile soils. St. George is susceptible to nematodes and supports relatively high populations of phylloxera. However, there are no examples of failure to phylloxera in the field. The leaves of St. George fold flat on themselves, are shiny green and bean-shaped in outline.
Foundation Plant Services at UC Davis is the source of Foundation grapevine material for the nursery industry, and the staff can provide information about possible sources for obtaining this stock.
The National Grape Registry (NGR) contains information about varieties of wine, juice, and table grapes, raisins, and grape rootstocks available in the United States. Growers, nurseries, winemakers and researchers can find background information and source contacts for those grape varieties in this single convenient location.
|Publications||Christensen, L.P. 2003. Rootstock Selection (PDF). Pages 12-15 in: Wine Grape Varieties in California. University of California Agricultural and Natural Resources Publication 3419, Oakland, CA. Buy book|