Winter Grape Day 2021

Grape Day

Event Date


The UC Davis Winter Grape Day will provide instruction to attendees on issues faced by the growers in the previous season. It will help them gain knowledge to be prepared for the upcoming season, featuring topics related to plant protection, water relations and management, soil fertility and mineral nutrition, soil health and alley management, as well as heat wave mitigation. 


This is a hybrid event. Attendees have the option of attending in-person at the Conference Center on the UC Davis Campus, or by live stream.



7:30 AM Breakfast  
8:00 AM Welcome

David E. Block, Chair and Professor, Department of Viticulture & Enology, UC Davis and Kaan Kurtural, UCCE Associate Cooperative Extension Specialist-Viticulture, Department of Viticulture & Enology, UC Davis

8:10 AM Leaf hopper management in vineyards  Monica Cooper, UCCE Farm Advisor-Viticulture, Napa County
8:40 AM Area-wide management of cover crops to mitigate TICA in GRBV affected areas Cindy KronUCCE North Coast Area IPM Advisor, Napa, Sonoma, Mendocino, and Lake Counties
9:10 AM Carbohydrate translocation in GRBV affected vineyards. Is there a mitigation strategy? Justin Tanner, Post-Graduate Researcher, Department of Viticulture and Enology, UC Davis
9:40 AM Wildfire smoke: Risk to grapevines, grapes, and wine Anita Oberholster, UCCE Associate Cooperative Extension Specialist-Enology, Department of Viticulture & Enology, UC Davis
10:10 AM Break  
10:30 AM Salinity tolerant rootstock evaluation in the San Joaquin Valley George Zhuang, UCCE Viticulture Advisor, Fresno County
11:00 AM A new index to determine plant water stress using surface renewal stations Daniele Zaccaria, UCCE Assistant Agricultural Water Management Cooperative Extension Specialist, Department of Land, Air, and Water Resources, UC Davis; Kaan Kurtural, UCCE Associate Cooperative Extension Specialist-Viticulture, Department of Viticulture & Enology, UC Davis
11:30 AM Using satellite data to aid irrigation management Mark Battany, UCCE Water Management and Biometeorology Advisor, San Luis Obispo and Santa Barbara Counties
12:00 PM Lunch  
1:00 PM Nitrogen in Table Grapes: Assimilation, Distribution, Fertilizer Recovery Efficiency and Monitoring Matthew Fidelibus, UCCE Cooperative Extension Specialist-Viticulture, Department of Viticulture & Enology, UC Davis
1:30 PM Nitrogen fertility in wine grape vineyards and what it means to you Tian Tian, UCCE Area Viticulture Advisor, Kern County
2:00 PM Cover Crops and Tillage Effects on Grapevine Physiology and Metabolism in a Mature Vineyard in San Joaquin Valley Maria Zumkeller, Graduate Student, Department of Horticulture and Agronomy, UC Davis
2:30 PM Soil health of Vineyards in Coastal California  Cristina Lazcano, Assistant Professor, Department of Land, Air and Water Resources, UC Davis
3:00 PM Break  
3:20 PM Should you be dropping unsold / smoke affected fruit Kaan Kurtural, UCCE Associate Cooperative Extension Specialist-Viticulture, Department of Viticulture & Enology, UC Davis
3:50 PM Harnessing spatial variability in wine grape vineyards.  How can sensing direct vineyard operations? Runze (Cliff) Yu, Assistant Professor, Department of Viticulture and Enology, Fresno State University 
4:10 PM Removing the heat from the vineyard in Napa Valley: Field results and vertical tasting Lauren Marigliano, Graduate Student, Department of Viticulture and Enology, UC Davis

DPR Units: 2.5 (confirmed)
CCA Units: 3.5 (confirmed)


$250/in-person or Livestream



If you need a hotel room, you can reserve one at the Hyatt Place Davis for $189/night before taxes and fees. This rate includes parking and breakfast.  


Per current UC Davis guidelines, all in-person event attendees must be fully vaccinated against COVID-19 or provide a negative COVID-19 test within 72 hours to attend the event. You must provide one of the following options when checking-in at the event.  

  1. Any attendee can show their CDC Vaccine Card (phone image acceptable) or digital vaccine record from the State of California.
  2. International students may show their translated vaccine record.
  3. UC Davis employees or students can show their valid Daily Symptom Survey compliance email.
  4. Unvaccinated individuals can show a negative COVID-19 test result from the last 72-hours. (must be a lab/PCR test; home tests/antigen tests are not valid)

The following is also required of all event attendees:

  • Visitors are required to complete a Daily Symptom Survey prior to entering facilities on campus. You will be asked to be show proof of this survey when checking-in at the event.
  • All attendees are required to wear face coverings indoors, regardless of vaccination status.
  • Unvaccinated individuals are also required to wear a face-covering outdoors in crowded spaces

For more information about current campus policies for visitors, please visit:

Guidelines are subject to change at any time as the COVID-19 situation evolves. We will be sure to communicate any changes as they occur.


If you are feeling under the weather, exhibiting any possible symptoms of COVID-19, or have been exposed to a positive COVID-19 case within the last 14 days, we ask that you stay home and do not attend the event. We will provide refunds for COVID-19 related reasons or transfer your payment to a future event. If you need to cancel for a COVID-19 related reason, please email