A webpage called Grape Varieties in the USA (https://grapevarieties.info) was developed with original information on some raisin, table, wine, and multi-use grapes. The website contains original descriptions, pictures, and data of various varieties, listed in alphabetical order of their variety names. Varieties can also be sorted by certain key attributes with the aid of pull-down menus. Sorting is additive, so one or more attributes can be used in a given search. Users can also select from keywords that variety description authors or editors have assigned to each variety, and there is also a search window in which users can supply their own search terms. By mid-January there were 20 article descriptions published on the site, written by four different authors, and several other descriptions are in preparation. Raisin varieties include all commercially significant Thompson-type raisin grapes currently grown in the USA. Table varieties include all those suggested by the California Table Grape Commission. Wine varieties include some of the best performing Vitis vinifera varieties from trials conducted at the Kearney Agricultural Center, and disease-resistant varieties contributed from colleagues in southern states. Descriptions in preparation include other lesser-known wine varieties that performed well in California variety trials.
By the end of the 2020-2021 funding cycle, we completed three of four On the Road educational events originally proposed in the 2020 AVF Extension and Outreach proposal (3Ms, Kern, and Alameda/Contra Costa). The fourth program was scheduled to take place in Shasta County, but the stakeholders decided it was best to wait for an in-person program. Unfortunately, the timing of the in-person Shasta program coincided with a COVID surge in Shasta County, so the program was postponed for a second time (see details below). Due to the COVID-19 pandemic, we applied for and received a No Cost Extension to use the 2020-2021 travel funds for 2021-2022 travel. We expect to complete all of the events proposed in 2021 before the 15th of April 2022 (proposal 2021- 1685). All of the On the Road events proposed back in January 2020 were completed virtually (except for Shasta) before the end of the grant cycle in April 2021. The first of the four events was a virtual program for Merced, Mariposa, and Madera Counties on February 22, 2021. We worked with Karl Lund (3Ms Viticulture Advisor) to determine topics and speakers of interest. The speakers were Kendra Baumgartner, Anita Oberholster, Kent Daane, Akif Eskalen, George Zhuang, and Helen Dahlke. The second OTR program on March 10, 2021, in Kern County, was developed with Viticulture Advisor, Tian Tian. Presenters were Andrew Walker, Kendra Baumgartner, Tian Tian, Akif Eskalen, Mason Earles, and Andrew McElrone. The third event took place virtually on March 16, 2021. We worked with Kamyar Aram, Alameda and Contra Costa Counties Specialty Crops Advisor, to determine speakers of interest. The speakers were Anita Oberholster, Megan Bartlett, Mason Earles, Andrew McElrone, and Andrew Walker. The fourth virtual OTR program of the 2020-2021 grant was originally scheduled for April 2021. We discussed topics and dates with a member of the Shasta Cascade Viticulture Association to determine relevant topics and potential dates. It was decided that the virtual format would not work so we scheduled an inperson program for November 3, 2021. We plan to complete the four On the Road (OTR) events, proposed in January 2021, before the end of April 2022. We were thrilled to successfully provide the first in-person OTR program for this grant cycle in Sonoma County at the Veterans Memorial Auditorium in Santa Rosa on November 18, 2021, working with the North Coast Integrated Pest Management Advisor (Cindy Kron) and the Sonoma County Winegrowers to get the word out to local stakeholders. Speakers were Kaan Kurtural, Anita Oberholster, Andrew Walker, and Cindy Kron and we had 78 attendees. We are on track to finish the three remaining OTR programs in Santa Barbara (February 22, 2022 at Pres’quile Vineyard and Winery), Santa Cruz (March 23, 28, or 30), and the Central Sierra (March 31, April 5, or April 6) before April 15, 2022. We have confirmed speakers for all three programs and are in the process of finalizing date and location for Santa Cruz and the date for the Foothills. We are working with UCCE viticulture advisors Mark Battany, Larry Bettiga, and Lynn Wunderlich to provide relevant topics for each region. The Shasta program, scheduled for Nov 3, 2021, was postponed for a second time (due to a local COVID spike), until November 2022.
By the end of the extended 2019-2020 funding cycle, we produced the five On the Road educational events originally proposed in the 2019 AVF Extension and Outreach proposal. Due to the COVID-19 pandemic, we applied for and received a No Cost Extension to complete the programs proposed for 2019-2020 by April 15, 2021. We actually completed all of the remaining programs (Lodi, Napa, Stanislaus, and Paso Robles (Temecula was completed in Nov 2019)) virtually, in December 2020 (proposal 2019-1685). So, we completed all of the proposed events for the 2019-2020 funding cycle (proposed in 2019), and we expect to complete all of the events proposed in 2020 before the end of April 2021 (proposal 2020-1685).
The first On the Road event in the previous (2019-2020) grant cycle took place in Temecula at the Wilson Creek Winery, on November 18, 2019. Unfortunately, due to COVID-19, only the Temecula event was held in person (see the 2020 Annual Report for details). The second program was originally scheduled to take place at the Grape Festival Grounds in Lodi on March 17, 2020. It ended up as a virtual OTR program on July 13, 2020. Forty people attended live and sixty viewed the recorded program online. The third program was scheduled to take place on March 31, 2020, at COPIA in Napa, and it ended up as a virtual program taking place on, July 15 and 16, 2020. The first day’s program had 100 live attendees and the second day had 96 attending live. Interestingly, only 25 viewed the recordings. The fourth 2019-2020 OTR program was organized with Kari Arnold and was originally scheduled to occur on April 8, 2020, at Harvest Hall in Stanislaus County. This program was also provided virtually on July 27, 2020. Forty-eight people attended the Zoom meeting live and 41 viewed the recording. The fifth and final program proposed in 2019 (UCD V and E On the Road in Paso Robles) took place on December 10, 2020, and had 120 people attending live! An additional 145 people viewed the recording online. Overall, we reached 759 individuals just through our 2019-2020 On the Road programs.
We plan to complete the four On the Road (OTR) events, proposed in January 2020, before the end of April 2021. The first of the four events will be a virtual program for Merced, Mariposa, and Madera Counties on February 22, 2021. We worked with Karl Lund (3Ms Viticulture Advisor) to determine topics and speakers of interest. Confirmed speakers: Kendra Baumgartner, Anita Oberholster, Kent Daane, Akif Eskalen, George Zhuang, and Helen Dahlke. The second event will take place virtually on March 16, 2021. We worked with Kamyar Aram, the Alameda and Contra Costa Counties Specialty Crops Advisor (including wine grapes), to determine speakers of interest. Confirmed Speakers: Anita Oberholster, Megan Bartlett, Mason Earles, Andrew McElrone, and Andrew Walker. The third OTR program in March/April 2021, in Kern County, is currently under development with the new Viticulture Advisor, Tian Tian. The fourth program of 2021 will also take place in the March/April 2021 timeframe. We are currently discussing topics and dates with a member of the Shasta Cascade Viticulture Association to determine relevant topics and dates for the program. We also organized fourteen virtual, one-hour “Office Hours with Dave and Anita” extension programs. Researchers in specific areas gave short summaries (20 min) of what is known about the topic and the research performed to date. We then opened up the Zoom meeting to questions from attendees.
Our project goal is to support network-based learning to improve pest and disease management outcomes. We accomplished this by providing technical expertise for data sharing among members of regional groups. Specifically, we: (1) investigated potential data sharing platforms and identified one that embodied many of the factors under consideration, including low cost, a simple user interface and robust sharing potential; (2) implemented this platform to share regional pest incidence data; (3) collected intermittent and formal feedback on the functionality of the data-sharing platform; (4) processed historical data collected by two regional groups and translated these data into meaningful and actionable management guidelines; (5) collected regional powdery mildew inoculum data that will be used to develop decision-support tools; (6) engaged members of the regional groups to provide technical support for data-sharing platforms, share results of data animation and visualization, and build potential for this approach to become self-sustaining.
By the end of the 2018-2019 funding cycle, we produced the four On the Road educational events (San Diego, Monterey, Lake, and Tulare) proposed in the 2018 AVF Extension and Outreach grant. We substituted Tulare for the originally proposed Kern County program due to the departure of the Farm Advisor, Ashraf El-Kereamy. In addition, we have completed one of the proposed events for the 2019-2020 funding cycle (proposed in 2019), and we expect to complete all of the proposed events before the end of the grant period (April 15, 2020).
The first On the Road event in the current (2019-2020) grant cycle took place in Temecula at the Wilson Creek Winery, on November 18, 2019. To determine the most relevant topics to present, we worked closely with Carmen Gispert, Viticulture Farm Advisor for Riverside, San Diego, and San Bernardino counties. This program was initially proposed as an experiment to bring an On Campus, theme-based, continuing education program to a region far from the Davis campus. We had several discussions with Carmen and in the end, we brought topics she thought would be of interest to her stakeholders (a traditional On the Road program). Anita Oberholster gave two talks,
one focused on cleaning and sanitation and the other covered smoke exposure. We introduced Mason Earles (AI and viticulture) and Megan Bartlett (Improving Grapevine water-use efficiency and drought tolerance), two of our new faculty members. David Block spoke about Phenolic Extraction and Wine Quality and Johann Martinez (Kurtural Lab) spoke about the Effects of Irrigation, Shade Nets, and Crop Load on Grape Composition and Wine Quality. We were excited to have such a great turnout, with 80 growers and vintners attending.
We plan to complete four more On the Road events (for a total of five) before the end of the current funding cycle. The first of the four events is scheduled to take place in San Joaquin County at Burgundy Hall in Lodi on March 17, 2020. We worked with Stephanie Bolton (Lodi Winegrape Commission), to determine topics and speakers of interest. Confirmed speakers include Anita Oberholster, Megan Bartlett, Elisabeth Forrestel, Mason Earles, David Block, and Ben Montpetit. The second event is scheduled on March 31, 2020, in Napa at COPIA. We worked with the Napa Valley Vintners to determine speakers of interest, which include: Anita Oberholster, Megan
Bartlett, Elisabeth Forrestel, Mason Earles, David Block, Andrew Waterhouse, and Ben Montpetit. The third (of the four left to complete) On the Road program is scheduled for April 8, 2020, in Stanislaus County in Harvest Hall. We are working with Kari Arnold, the local farm advisor, to determine topics and speakers. The fourth program of 2020 and fifth overall is scheduled to take place in San Luis Obispo County. We are currently looking at March 19 or April 9, 2020 as favorable dates and have discussed topics with Mark Battany. Other extension efforts include organizing this year’s On Campus programs while we go through the process of hiring an event
By the end of the 2017-2018 funding cycle, we produced the four On the Road educational
events (Foothills, Santa Cruz, Temecula, and Sonoma) proposed in the 2017 AVF Extension and
Outreach grant. In addition, we have completed one of the proposed events for the 2018-2019
funding cycle (proposed in 2018), and we expect to complete all of the proposed events before
the end of the grant period (April 15, 2019).
The first On the Road event in the current (2018-2019) grant cycle took place in San Diego
County at the Center for the Arts, Escondido, on November 29, 2018. To determine the most
relevant topics to present, we worked closely with Carmen Gispert, the Viticulture Farm Advisor
for Riverside, San Diego, and San Bernardino counties. We were excited to have such a great
turnout, with 101 growers and vintners attending. David Block gave an introduction to winery
design, focusing on important considerations for quality through cleanability. Anita Oberholster
spoke about reuse of winery wastewater, Andrew McElrone spoke about deficit irrigation (what
is it, what are the benefits, and how do you do it?), Andrew Walker gave pointers on what to
consider when putting in a new vineyard, Kaan Kurtural talked about the practical aspects of
canopy management, and Carmen gave an update on her irrigation study.
We are planning to complete three more On the Road events before the end of the current
funding cycle. The first of the three events is scheduled to take place in Monterey County at the
Monterey County Cooperative Extension Office in Salinas. We worked with Area Viticulture
Advisor, Larry Bettiga, to determine topics and speakers of interest. Confirmed speakers
include: Neil McRoberts (Managing vector spread/virus diseases of grape), Anita Oberholster
(The effect of grapevine red blotch virus on wine quality), Megan Bartlett (New faculty member
introduction), Andrew McElrone (Understanding how grapevine roots respond and recover),
Andrew Walker (Current and future objectives of the grape breeding program at UC Davis),
Kaan Kurtural (Precision viticulture), and Larry Bettiga (Using plant material to promote early
vine development). The second event is scheduled on April 2, 2019, in Tulare County. We
originally worked with Ashraf El-Kereamy, Viticulture Farm Advisor for Kern County, to
determine relevant topics, however, he recently resigned from his position, so we are now
working with Gabriel Torres, the Viticulture Farm Advisor in Tulare County, to bring the
program to fruition. Confirmed speakers include Andrew McElrone, Anita Oberholster, Kendra
Baumgartner, Gabriel Torres, and Kaan Kurtural. We are arranging a final 2018-19 On the Road
program in Lake County, with Glenn McGourty, which will include presentations covering
smoke taint, sometime before April 15, 2019 (probably March 28, 2019). Other extension efforts
include organizing the 2018 Recent Advances in Viticulture and Enology and a couple of this
year’s On Campus programs including Bottling Line Readiness (March 2019) and the upcoming
Irrigation and Water Management program honoring Larry Williams (April 18, 2019).
- Summary: “Formation of a Mealybug Biocontrol Research Focus Group for Crush District 11”
by PI Dr. Stephanie Bolton, Lodi Winegrape Commission
The project has successfully met its objectives as stated during the period of March 2017 –
April 2018. The Lodi Mealybug Biocontrol Research Focus Group met monthly at a local diner
to discuss vine mealybug biocontrol, researching topics such as which beneficial insects are
present and effective in our area, current grower perceptions of beneficial insects and mealybugs,
the likelihood of neighbor cooperation in vine mealybug management, ant control, Movento,
organic options for mealybugs, and other topics related to vine mealybug biocontrol and
management. The Focus Group became a center of learning and exploration where scientists,
extension personnel, growers, pest control advisors, and the industry opened communication
around the subject of mealybug biocontrol in efforts to develop real-world, applicable outreach
materials and events which would propel our local winegrape industry forward and decrease our
risk for further leafroll virus infections.
Through the conversations and learning experienced during the Focus Group monthly meetings,
along with information gathered via expert consultants and educational field trips, a strategy for
mealybug biocontrol in Crush District 11 was established. This simple strategy is:
- Don’t kill the good insects.
- Control the ants.
- Use pheromone mating disruption.
In Lodi, we are still generally in phase 1 where we are teaching growers how to keep their
beneficial insects alive through distribution of an easy-to-read chart based upon UC IPM
guidelines and local experience (available at lodigrowers.com). In August 2017 at a Mealybug ID
Field Day, about 120 growers had a fun time learning how to identify mealybugs which have been parasitized by the Anagyrus wasp, one of the two main biocontrol agents in our region. During the April 2018 Mealybug & Virus Outreach Meeting, about 150 growers learned the significant
role of ants in the vine mealybug and leafroll virus story. The Focus Group has planned ant bait
experiments for 2018 after finding that there is no economical, efficient ant control method
available for large acres of vineyards. While pheromone mating disruption is being used with
success in our region to decrease mealybug populations and to attract beneficial insects, it is still
cost-prohibitive for many growers. Growers were given mealybug traps donated by Suterra at the
April 2018 meeting, which they will bring back in May 2018 for a follow-up Mealybug Trap
Workshop. Thus, they are learning whether the male mealybug is present in their field and how
to use the traps, which is the first step towards neighborhood coordinated pheromone mating
By taking the time to fully assess the current mealybug biocontrol management options in the
region and to learn more about the pathogen itself, future priorities for more targeted research on
a larger scale were best determined. Priorities include but are not limited to: discovering an
efficient and cost-effective ant control method for large acreage in Crush District 11, learning how to release Cryptolaemus beetles in our vineyards, and learning how to eliminate underground vine mealybugs following a leafroll virus infected vineyard rip-out.
Our objective is to provide technical support for data sharing among members of regional groups to advance coordinated disease management efforts. In this first of a proposed 2-year project, we conducted the following activities in support of that objective: (1) We investigated potential data sharing platforms and identified one that embodied many of the factors under consideration, including low cost, a simple user interface and robust sharing potential. (2) We worked with a grower group to implement this platform to share regional pest incidence data. (3) We collected intermittent and formal feedback on the functionality of the data-sharing platform. This feedback will be used to augment the data sharing protocol in year 2. (4) We processed historical data collected by a grower group and conducted a preliminary visualization and analysis to facilitate the translation of data into meaningful and actionable results. We intend to continue this analysis in the 2nd project year. (5) We engaged members of the regional groups to provide technical support for data-sharing platforms, share results of data animation and visualization, and are building potential for this approach to become self-sustaining.
At the end of the 2016-2017 funding cycle, we will have produced the four On-the-road educational events proposed in the AVF Extension and Outreach grant. In addition, we completed all proposed events for the 2015-2016 funding cycle, before the end of the grant period (as proposed), described in last year’s annual report.
The first On-the-road event in the current (2016-2017) grant cycle took place in Madera. Karen Block worked with Lindsay Jordan, Area Viticulture Advisor for Madera, Merced, and Mariposa counties, to determine topics of regional interest and invited individuals working in those areas to speak at this educational event. Turnout was not as high as expected, due to American Vineyard Magazine’s Fruit and Nut Expo occurring nearby in Fresno. We were not aware of this until four weeks before the event, and had other circumstances with scheduled speakers, so we were unable to reschedule. Those who did attend found it quite informative. Lindsay Jordan spoke about Alternative Winegrape Varieties for a Warm Climate, Anita Oberholster spoke about the Impact of Winery Wastewater Irrigation on Soil, Grape Nutrition, and Grape and Wine Quality, Ben Montpetit gave a summary of his background and the types of research he will pursue, Matt Fidelibus spoke about, “Shade from trellised vines as a weed suppressive cropping system,” David Block talked about cap management in red wine fermentations, and Kaan Kurtural spoke about the advantages of vineyard mechanization.
We are planning to complete three more On the road events before the end of the current funding cycle. The first event is scheduled to take place in Acampo, at the Constellation Woodbridge Winery, on February 28, 2017, the second is scheduled for March 24, 2017, in Napa County, at the Yountville Community Center, and the last is scheduled in Paso Robles at J. Lohr Vineyards and Wines, between March 20 and April 15, 2017. Karen Block has been working with Paul Verdegaal and Stephanie Bolton for the Lodi event; Monica Cooper, Michelle Novi, and Sonya DeLuca for the event in Napa; and Mark Battany and folks at J. Lohr for the Paso Robles event. The event in Lodi is focused on viruses and diseases and the speakers will be John Roncoroni, Maher Al Rwahnih, Kari Arnold, Monica Cooper, Neil McRoberts, and Anita Oberholster. For the Napa County event, the confirmed speakers are Kerri Steenwerth, Kaan Kurtural, Ben Montpetit, Andrew Waterhouse, Andrew Walker, and Anita Oberholster. Mark Battany and Karen Block are still working on dates and speakers for the Paso Robles On the road event.
At the end of the 2014-2015 funding cycle we will have produced five On-the-road educational events. In addition, we hosted several industry-related events on the UC Davis campus. The first On-the-road educational event in this grant cycle took place in Lodi in April 2014. Like the previous Lodi event, it was held at the Woodbridge Winery in their barrel room. The general theme was water issues. The event was well attended, with approximately 60 attendees. The next On-the-road event will be in the Foothills. To determine what topics to present, we conducted a survey of growers and vintners in the region, consulted with the local farm advisor (Lynn Wunderlich) and visited potential host wineries. As a result of the background work, we are presenting an On-the-road event that will take place at Terra D’Oro Winery (Plymouth, CA) on Feb 27, 2015, with David Mills, Anita Oberholster, David Block, Linda Bisson and Lynn Wunderlich confirmed to speak. We have two more On-the-road events scheduled before the end of the funding cycle. One event is scheduled to take place at the Kearney Agricultural Research and Extension Center in Parlier on March 31, 2015, and the other is scheduled for April 1, 2015, at the University of California Cooperative Extension Office in Salinas. The event in Parlier will mainly address enology issues (as discussed during our visit to the area in early November 2014). The event in Salinas will cover mainly viticulture topics and enology related to viticulture. For the Parlier event we have confirmed David Block, Anita Oberholster, Dario Cantu and Andy Waterhouse and for the Salinas event, we have David Block, Anita Oberholster, Larry Bettiga and Dario Cantu. In addition, we occasionally help the Napa Valley Vintners with their educational events and have presentations by Sue Ebeler, Linda Bisson, and Anita Oberholster scheduled for February 4, 2015, at the Napa Marriott. We are also in the process of scheduling an educational event in Sonoma later in April 2015, as part of the next grant cycle. Other extension efforts building from AVF support of the IRM include: hosting and setting up seminars for the International Cabernet Symposium, the California Sustainable Winegrowing Alliance, National Grape and Wine Initiative, and co-chairing Recent Advances in Viticulture and Enology with Anita Oberholster. In November 2014, Anita Oberholster and Karen Block organized a tasting of wines irrigated with well versus recycled winery water for the Napa Valley Grapegrowers, as part of their Rootstock event. In addition, each year, Karen Block organizes the UC Davis Viticulture and Enology Unified Reception, which brings together 150-200 alumni, faculty, friends and students on Wednesday evening of the Unified Wine and Grape Symposium in Sacramento.