Please join the Lodi Winegrape Commission on Thursday, December 1st at Burgundy Hall to celebrate 30 Years of Rootstock Research at Liberty Vineyard! The meeting is co-hosted by the Lodi Winegrape Commission and E. & J. Gallo Winery. The agenda with the full list of speakers is below.

Attendance is FREE and open to everyone. Kindly RSVP by today so that we can get a count for the luncheon catered by Tin Roof BBQ.


December 1st, 2022  •  Lodi Grape Festival Grounds, Burgundy Hall, 413 E Lockeford St, Lodi, CA

7:30 – 8:00am    Registration & Coffee

8:00 – 8:40am    Grapevine Rootstocks: Characteristics & Commercial Use
                             Andy Walker, PhD, Professor Emeritus, Department of Viticulture and Enology, UC Davis

8:40 – 9:00am    The Diaz-Garcia Lab Breeding Program
                             Luis Diaz-Garcia, PhD, Assistant Professor, Department of Viticulture and Enology, UC Davis

9:00 – 9:30am    Lodi Liberty Rootstock Trial: Genesis & Initial Results
                             Paul Verdegaal, Viticulture Farm Advisor Emeritus, UC Cooperative Extension San Joaquin Co.

9:30 – 10:15am    Grapevine Nutrition Results
                              Matt Comrey, Agronomist, Wilbur-Ellis

10:15 – 10:30am   BREAK

10:30 – 11:00am    Grapevine Virus Testing & Results
                               Evan Hedrick, Director, Laboratory Services, Wonderful Laboratories

11:00 – 11:15am    Nematode Testing & Results
                               Jackie Harris, Grower Outreach, E. & J. Gallo Winery

11:15 – 12:00pm   Viticultural Performance of Select Grapevine Rootstocks after 30 Years
                               Keith Striegler, PhD, Grower Outreach, E. & J. Gallo Winery

12:00 – 12:15pm   Rootstock Trials at the UC Oakville Station
                               Justin Tanner, PhD, Future Viticulture Farm Advisor, UC Cooperative Extension San Joaquin Co.

12:15 – 12:30pm   The Lodi Grapevine Rootstock Research Focus Group
                               Stephanie Bolton, PhD, Research & Education Director, Lodi Winegrape Commission

12:30 – 1:30pm    Tri-Tip Lunch from Tin Roof BBQ (RSVP required)

RSVP by November 28
: To the Lodi Winegrape Commission at 209.367.4727 or

A Recent Journal Article about the Liberty Vineyard Trial:

“Grapevine rootstocks affect growth-related scion phenotypes.” 2021.
By Zoë Migicovsky, Peter Cousins, Lindsay M. Jordan, Sean Myles, Richard, Keith Striegler, Paul Verdegaal, and Daniel H. Chitwood.

2019 Lodi Rootstock Field Day:  

To view the full proceedings from the 2019 Rootstock Field Day click HERE.

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