Current UC Viticulture Research
|Principal Investigator||Deborah Golino|
|Project Title||Virus Effects on Vine Growth and Fruit Components of Cabernet Sauvignon on Six Rootstocks|
A research block was planted at the UC Oakville Station in Napa Valley to provide data on the effects of viruses on Cabernet Sauvignon FPS5 grafted on six rootstocks. Rootstocks included: 3309C, 5BB, 1103P, 110R, 101-14, and St. George. Viruses included: Grapevine leafroll associated viruses (GLRaVs), Grapevine virus B (GVB), Grapevine fleck virus (GFkV) and Rupestris stem pitting associated virus (RSPaV), in single and mixed infections. Virus isolates were: LR101—a single infection of GLRaV-3; LR109—a mixed infection of GLRaV-2, GLRaV-3, and GFkV; RSP115—a single infection of RSPaV, and LR102—a mixed infection of GLRaV-1, GLRaV-2, GLRaV-5 and GVB.
Titratable acidity was significantly affected, depending on rootstock and virus, on all rootstocks except 101-14 (Figure 2).
Yield and other growth and fruit components were variably affected, depending on rootstock and virus. Yield reductions of 50 to 88% were observed in 101-14 and Kober 5BB when infected by leafroll. Several vines on 5BB infected with leafroll isolate LR109 yielded no fruit at all. On the other hand, St. George and 1103P showed no yield effect, indicating that these two rootstocks are fairly tolerant to leafroll viruses (Figure 3).
The original goal of making wine from these vines to more clearly establish the effects of virus-infection on wine quality could not be completed due to concern about the rapid field spread of leafroll disease in this area (Golino et al., 2008).
Project photos: Click on thumbnail to enlarge.
California Observation of Leafroll Effects and Field Spread: Dr. Deborah Golino, Cooperative Extension Specialist, Department of Plant Pathology, UC Davis, discusses her observations of leafroll effects and field spread over the last 15 years in this videotaped presentation.
|Researchers and Cooperators|
Golino, D. A. 1992. The Davis Grapevine Virus Collection. American Journal of Enology and Viticulture 43(2):200-205. Abstract
Golino, D.A., Sim, S.T., Weber, E. and Rowhani, A. 2008. Leafroll disease is spreading rapidly in a Napa Valley vineyard.(pdf) California Agriculture 62(4):156-160.
Rowhani, A., 1992. Use of (ab)2 antibody fragment in ELISA for detection of grapevine viruses. Am. J. Enol. Vitic. 43:38–40. Abstract
Rowhani, A., Biardi, L., Johnson, R., Saldarelli, P., Zhang, Y.P., Chin, J., and Green, M. 2000. Simplified sample preparation method and one-tube RT-PCR for grapevine viruses. In: Proceedings of XIII International Council for the Study of Viruses and Virus-Like Diseases of the Grapevine, Adelaide 2000,p. 82.