Chardonnay and Cabernet Sauvignon varieties were grafted onto phylloxera-resistant rootstocks in a vineyard not yet infested with the insect in the south central coastal region. Rootstocks influenced growth and yield, as well as composition and quality of juice and wine, but a major consideration would be phylloxera resistance.

The authors thank Boyd, Clare, and Lee Bettencourt of Vina de Santa Ynez Vineyard and Lizanne Righetti, UC Field and Laboratory Assistant, San Luis Obispo County, for their cooperation in this experiment.