- Vineyard acreage in Oregon continues to increase at a rapid pace. In the past two years alone 1600 acres of new vineyard land have been planted (Rowley et al., 2000). Much of this has been on phylloxera-resistant rootstocks. This practice is strongly encouraged, since it is the only practical way of dealing with this pest. At the same time, established vineyards in the state that have been affected by phylloxera are being replanted onto rootstocks. Although planting on rootstocks is more expensive than planting own-rooted vines, it also provides the grower an opportunity to control vine vigor and affect fruit composition. Unfortunately there is little data specific to Oregon, on which the grower can base his or her choice of rootstocks. In order to fulfill this need, an experiment was begun in 1997 to evaluate the performance of 19 different rootstocks, onto which four different varieties were grafted. This experiment is being conducted at Oregon State University's Woodhall III Vineyard, five miles west of Alpine, Oregon. The data presented here is from this experiment and was collected during the 2000 growing season.