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2017 Grape Day
Management of Trunk Disease, Grapevine Viruses and Fungicide Resistance

LaSells Stewart Center, OSU Campus, Thursday, April 6
For maps and parking information, click here.
Registration is $65 and includes a research abstract booklet and lunch (gluten-free/vegan/vegetarian options)
To register, click here.
ODA Pesticide Recertification credits will be available at this event
Registration Deadline- Friday, March 31, 12 NOON


Join us on campus at Oregon State University for our annual event highlighting research relevant to the Oregon wine industry. This information will be presented by members of the Oregon Wine Research Institute and guest speakers from University of California, Davis and Pacific Agri-Food Research Centre. This year, we are focusing on management of trunk disease, grapevine viruses and fungicide resistance.


8:30 - 9:00 AM: Registration* and Refreshments
9:00 - 9:05 AM: Introduction and Welcome

9:05 AM – 9:50 AM: Management of Grapevine trunk diseases: a difficult but not impossible task
Dr. José Ramón Úrbez-Torres, Agriculture & Agri-Food Canada, Summerland Research and Development Centre, British Columbia

Grapevine trunk diseases (GTD) occur wherever grapes are grown and are currently considered the main biotic factor limiting both vineyard longevity and productivity. After prohibition of effective control products against GTD in early 2000 due to human health risks and environmental concerns, no management strategies were available for grape-growers to control these diseases. The aim of this talk is to present a summary of the research conducted in the last decade to find solutions against GTD. Control strategies to be discussed will include cultural practices, and currently available chemical products and biological agents.


10:00 AM – 10:45 AM: Red Blotch in Oregon
Dr. Vaughn Walton, Associate Professor, Horticultural Entomologist, OSU Department of Horticulture

This session will focus on the current levels of Red Blotch in several Oregon vineyards.  We will talk about the patterns and levels of Red Blotch spread in Southern Oregon and the Willamette Valley.  Additional topics will include presumed insect vectors of Red Blotch, their biology, seasonal occurrence and spatial distribution.  Basic principles to minimize the spread of viruses in vineyards will be highlighted.


10:45 AM – 11:45 AM: Interactive Poster Session 

This session will provide you the opportunity to interact one-on-one with scientists and students conducting research at the OWRI. These posters will feature research findings that are in-progress for various research projects being conducted across a wide array of topics within viticulture and enology, including physiology, pathology, entomology, education, and more.


11:45 AM – 12:30 PM: Grapevine Leafroll Disease Impact
Dr. Laurent Deluc, Associate Professor, Grape Genomics, OSU Department of Horticulture

Dr. Laurent Deluc will summarize the impact of Grape-Leaf Roll Virus 3 on berry ripening. Along with innovative field and molecular approaches aimed to limit virus propagation, a holistic and multidisciplinary approach employing contemporary tools of functional genomics may contribute to help elucidate different aspects of this complex disease.


12:30 - 1:30 PM: Lunch


1:30 PM – 2:15 PM: Grape Powdery Mildew Management: An Integrated Approach
Brent Warneke, OSU Botany and Plant Pathology Graduate Student of Dr. Walter Mahaffee, USDA Research Plant Pathologist

Grape powdery mildew is a perennial problem that is traditionally managed with numerous fungicide applications at regular intervals. Little attention is typically paid to plant growth stage and fungicide selection, two of the most important factors at play in managing the disease. Long term use of fungicides has led to the buildup of resistant strains in Oregon and periodic resistance development by grape powdery mildew will continue. Integrating concepts of plant phenology, fungicide action and disease status optimizes fungicide applications and results in more effective disease management.


2:15 PM - 2:45 PM: Break/Poster Session 


2:45 PM – 3:30 PM: Effects of Red Blotch on Wine Quality
Dr. Anita Oberholster, Cooperative Extension Specialist in Enology, Department of Viticulture and Enology, University of California, Davis

Grapevine Red Blotch-associated Virus (GRBaV), is the causal agent of Red Blotch Disease.  At this stage very little is known about the effect of this virus on both grape and wine composition and quality.  The influences of cultivar and environmental factors are also not known.  There is thus a clear need to determine the impact of GRBaV on grape and wine composition and wine quality.  Only after we have quantified the impact of the disease can we make recommendations to the industry so that informed decisions can be made regarding the future of infected vines.  Preliminary research investigating three varieties (Chardonnay, Cabernet Sauvignon and Merlot) at different AVA’s in California shows a potential synergistic impact of site (environment) and cultivar.



*Registration must be completed in advance. On-site registration is to obtain your conference proceedings, name tag, and enjoy beverages before the beginning of the event.

 For more information, contact Denise L. Dewey at denise.dewey@oregonstate.edu