Annual Sonoma County Grape Day handouts and recordings dating back to 2002. On this page you will find presentations sorted by:
- Diseases
- Grapevine Disorders
- Insect and Other Pests
- General including mechanical harvest and canopy management, nutrient management, smoke taint and more
- Recordings ***NEW*** all presentations from 2020
Diseases
- 2020: Grape Downy Mildew: Identification Symptoms and Control - Rhonda Smith
- 2020: Grapevine Trunk Diseases - Akif Eskalen and Jose Ramon Urbez-Torres
- 2019: Update - Vine performance in site infested with X. index nematode - Rhonda Smith
- 2019: Revisiting our understanding of Pierce's disease epidemiology in the North Coast - Matthew Daugherty
- 2018: Growing vines in sites infested with Xiphinema index - Rhonda Smith
- 2018: What the mildew - Grape powdery mildew resistance and tools for management - Walt Mahaffee
- 2018: What the mildew - A perspective on another challenging year managing powdery mildew - Walt Mahaffee
- 2017: Grapevine Red Blotch Disease: Grapevine physiology - Cassandra Plank
- 2017: Grapevine Red Blotch Disease: Petiole nutrient levels - Rhonda Smith
- 2017: Grapevine Red Blotch Disease: Its spread and an insect vector - Frank Zalom
- 2016: Pierce's disease biology and management in the North Coast - Matthew Daugherty
- 2015: Strategies in Powdery Mildew Management - Michelle Moyer
- 2015: Purchasing Grapevine Nursery Stock - Tony Linegar
- 2015: Impact of Red Blotch disease on grape and wine composition - Anita Oberholster
- 2015: Red blotch disease effects on yield and fruit - Rhonda Smith
- 2014: Impact of Red Blotch on Wine Composition and Quality - Anita Oberholster
- 2014: Grapevine Red Blotch Disease; 2013 Field Research Results - Rhonda Smith
- 2012: Biology, Epidemiology, and Control of Powdery Mildew - Doug Gubler
- 2012: Botrytis Bunch Rot - Doug Gubler
- 2012: Powdery mildew biology and control; An Eastern Perspective - Wayne Wilcox
- 2012: Understanding and Controlling Botrytis - Wayne Wilcox
- 2006: 2005 Trial - Effect of boron fertilizer applications on grapevine pruning wounds on bud break, boron tissue levels and vine yield - Rhonda Smith
Grapevine Disorders
- 2014: SOUR Shrivel; Killing the Berry Softly - Baskhar Bondada
- 2013: Pinot Leaf Curl - a nitrogen disorder - Rhonda Smith
- 2012: Pinot Leaf Curl - Rhonda Smith
- 2007: Berry Shrivel Research Update - 2005 and 2006 investigations - Rhonda Smith
- 2004: Berry Shrivel Research Update - Rhonda Smith
- 2003: Berry Shrivel - Rhonda Smith
Insect and Other Pests
- 2020: Grapevine red blotch virus vector research - Cindy Kron
- 2019: Preemergence herbicide programs for vineyard production systems - Brad Hanson
- 2017: GRN rootstock performance in field trial - Larry Bettiga
- 2017: Weed Control Update: Fluvellin, Ryegrass and other weeds - John Roncoroni
- 2016: Mealybug research: - from pesticide movement in the vine to their possible role as vectors of plant viruses - Kent Daane
- 2014: UPDATES: Brown Marmorated Stink Bug / Virginia Creeper Leafhopper / European Grapevine Moth - Lucia Varela
- 2012: European Grapevine Moth in 2012 - Lucia Varela
- 2011: Looking for Lobesia botrana in Infested Clusters Processed for Wine Making - Rhonda Smith
- 2005: Fate of Vine Mealybug in Winery Waste - Rhonda Smith
General
- 2019: Smoke taint: Effect of wildfires on fruit and wine composition - Thomas Collins
- 2019: How leaf removal and dropping fruit affects berry ripening - Kaan Kurtural
- 2018: Source-sink influence on ripening and fruit composition - Kaan Kurtural
- 2018: Steps in mechanical canopy management - Luca Brillante
- 2018: Nitrogen mineral nutrient management in California vineyards - Larry Williams
- 2018: UCD VEN course 115 - Fertilization of Grapevines in California - Larry Williams
- 2018: Mechanical harvesting of winegrape vineyards-tools of the trade - Kaan Kurtural
- 2017: Factors that affect fruitfulness and budbreak in cane pruned vines - Matthew Fidelibus
- 2017: Assessing vineyard variability through a spacially explicit selective-harvest approach - Luca Brillante
- 2016: Managing berry phenolic composition with mechanical crop management and applied water - Kaan Kurtural
- 2015: Infuence of Vit Practices on Juice YAN - James Kennedy
- 2014: Development of Surface Renewal as stand-alone user friendly tool to measure grapevine evapotranspiration - Andrew McElrone
- 2009: Update on effects of CPPU on fruit set in Merlot - Rhonda Smith
- 2008: Effects of CPPU, a synthetic cytokinin, on fruit set and yield - Rhonda Smith
- 2006: 2005 Hang Time Evaluation - Rhonda Smith
- 2002: Utilization of Composted Mulch for Erosion Control in Hillside Vineyards - Rhonda Smith
Recordings
2020
Grape downy mildew: Identification, symptoms and control
Rhonda Smith, UC Cooperative Extension Viticulture Advisor, Sonoma County
Duration: 00:29:02
Correcting In-Season Potassium Deficiencies in Grapevine
Dr. Kaan Kurtural, Extension Viticulture Specialist, UC Davis and UC Oakville Experiment Station
Duration: 00:24:53
Grapevine red blotch virus vector research
Dr. Cindy Kron, UC Cooperative Extension North Coast IPM Advisor
Duration: 00:38:45
Source-sink relationships in grapevine: Storage reserves and fruiting
Dr. Kaan Kurtural, Extension Viticulture Specialist, UC Davis and UC Oakville Experiment Station
Duration: 00:39:04
Grapevine trunk diseases in California: Research updates
Dr. Akif Eskalen, UC Cooperative Extension Specialist; UC Davis Department of Plant Pathology
Duration: 00:56:53
2016
Mealybug research - from pesticide movement in the vine to their possible role as vectors of plant viruses
Dr. Kent Daane, UC Berkeley
Duration: 00:53:28