Figure 2: Field-grafted vines showing leafroll-like symptoms in a red grape cultivar. These Riesling vines were field grafted with scion budwood from Syrah. The grafted vine on left shows severe symptoms and tested positive for grapevine red blotch-associated virus (GRBaV). The nonsymptomatic vine on right is negative for the virus. (Courtesy Naidu Rayapati)