Viticultural Information

Subject	Grapevine Leafroll Disease - An Increasing Problem for California Vineyards
Description	This UC Davis Extension Course was held June 10, 2008 at Freeborn Hall, UC Davis. The links below contain video presentations in an easy-to-use format. No additional software is required. New research suggest that leafroll disease has become a far more serious problem in California vineyards than previously recognized. The disease was assumed to be largely graft-transmitted under California conditions. Unfortunately, this situation seems to have changed. In the face of what may be a epidemic wave of leafroll spread, experts with leading research programs on leafroll disease and its vectors, mealybugs and soft scale have been brought from around the world to share their knowledge. See also Leafroll Disease and Grapevine Leafroll Disease Symposium 2.0
People	Rodrigo Almeida Kent Daane Deborah Golino Adib Rowhani
Links	The Grapevine Leafroll Disease - An Increasing Problem for California Vineyards seminar was videotaped in excellent quality by UC ANR Communication Services. These Adobe Presenter files do not require any special software to run, but please wait about 12 seconds after clicking a link for the video to begin. Controls for the slides are provided. “GRAPEVINE LEAFROLL DISEASE – OUR STATE OF KNOWLEDGE” From Italy, Dr. Giovanni Martelli, Professor, Istituto di Patologia Vegetale, Università di Sassari Dipartimento di Protezione delle Piante, Università di Bari, explains what is known about the leafroll viruses based on his many years of leadership in the grape virology community. "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. “DETECTING GRAPEVINE LEAFROLL AND VITIVIRUSES” Dr. Adib Rowhani, Project Scientist/Plant Pathologist, Foundation Plant Services, UC Davis, describes tests used for detecting leafroll disease and vitiviruses. “TRANSMISSION BIOLOGY OF LEAFROLL DISEASE" Dr. Rodrigo Almeida, Assistant Professor, Department of Environmental Science, Policy, & Management, UC Berkeley explains the biology behind transmission of leafroll disease and its mealybug vector “MEALYBUG POPULATIONS IN CALIFORNIA" Dr. Kent M. Daane, Cooperative Extension Specialist, Department of Environmental Science, Policy, & Management, UC Berkeley, lectures on the biology and control of mealybug in California. “LESSONS LEARNED FROM YEARS OF MANAGING LEAFROLL VIRUS IN NEW ZEALAND VINEYARDS” Dr. Jim Walker and Vaugn Bell, Hawke’s Bay Research Centre, HortResearch, share insights from their work in New Zealand, where leafroll spread is a serious and common problem. "VINE HEALTH AND LONGEVITY" Dr. Roderick Bonfiglioli, Riversun Nursery and Linnaeus Laboratory, Gisborne, New Zealand, speaks about nurseries and mapping leafroll disease spread. "MOLECULAR STRATEGIES FOR THE CONTROL OF LEAFROLL DISEASE" Dr. Marc Fuchs, Department of Plant Pathology, Cornell University, New York, speaks about conventional and molecular strategies for leafroll control.
Publications	Alkowni, R., Rowhani, A., Daubert, S., abd Golino, D.A. 2004. Partial Characterization of a new Amepelovirus associated with grapevine leafroll disease. Journal of Plant Pathology 86: 123-133. Flaherty, D., Christensen, L., Lanini, W., Marois, J., Phillips, P., and Wilson, L. 1992. Grape Pest management 2nd Edition. Agricultural Sciences Publications, #3343, University of California, Oakland, CA. Golino, D.A., Sim, S., Gill, R., and Rowhani, A. 2002. Grapevine leafroll disease can be spread by California mealybugs (PDF). California Agriculture 56 (6):196-201. Martinson, T., Fuchs, M., Loeb, G. and Hoch, H. 2008. Grapevine Leafroll – an Increasing Problem in the Finger Lakes, the US and the World (PDF). Finger Lakes Vineyard Notes, 6: 6-11, Cornell University Cooperative Extension. Rowhani, A., Uyemoto, J.K., Golino, D., Martelli, G.P. 2005. Pathogen testing and certification of Vitis and Prunus species. Annual Review of Phytopathology 43: 261-278. Pearson, R., and Goheen, A., 1988. Compendium of Grape Diseases. APS Press, St. Paul, Minnesota. Weber, E., Golino, D.A., and Rowhani, A., 1993. Leafroll disease of grapevines. Practical Winery and Vineyard. XIV: 21-24. Weber, E., Golino, D.A., and Rowhani, A., 2002. Laboratory testing for grapevine virus diseases (PDF). Practical Winery and Vineyard XXII (2): 13-26.

This website is a work in progress of the University of California (UC) Division of Agricultural and Natural Resources (ANR) Integrated Grape Production Workgroup. It is designed to increase accessability to the work of UC researchers, including faculty, Cooperative Extension (CE) specialists, CE advisors, and staff. UC Researchers interested in contributing content are invited to contact Deborah Golino dagolino@ucdavis.edu to discuss possible contributions.