Preventing and Mitigating Low Temp Injury or Cold Damage in Grapevines
Grapegrowing Breakout Session

Cold injury is a significant limitation for successful grape production in many areas of North America. Injury may occur in the Fall before vines are fully acclimated, during the mid-winter period when low temperatures exceed the vines maximum hardiness level, and in the Spring when vines are de-acclimating in response to warming temperatures. In addition, significant low temperature injury can occur after vine buds are developing and green tissue is present (frost damage).

An increased number of extreme events, including low temperatures, are predicted to occur because of Climate Change. Information will be presented on practices growers can utilize to avoid or prevent cold injury as well as those that can be used for mitigation when injury has occurred. In addition, growers will provide insight into how they have been impacted by and responded to recent freeze events.

*Session receives 1 CEU: Crop – Weather Effects on Crop Management   


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Keith Striegler
E. & J. Gallo Winery, California

Keith Striegler earned his Ph.D. in Horticulture from Michigan State University in 1990, his M.S. in 1982 and B.S. in 1979 in Horticulture Food Science from the University of Arkansas. He has been the Grower Outreach Specialist for E&J Gallo Winery since 2014.

Prior to that he was the Outreach Coordinator for the National Clean Plant Network from 2012-2014. From 2006-2011 he was the Director and Viticulture Program Leader at the University of Missouri. Earlier in Missouri he was the Assistant Director – Viticulture for the Mid-America Viticulture and Enology Center at Missouri State University from 2003-2006.

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Markus Keller
Washington State University, Prosser

Markus Keller is the Chateau Ste. Michelle Distinguished Professor of Viticulture at Washington State University’s Irrigated Agriculture Research and Extension Center in Prosser. He received his MS in plant science and PhD in natural sciences from the Swiss Federal Institute of Technology in Zurich. His research focuses on environmental factors and management practices as they influence crop physiology and production of wine and juice grapes.


Ken Kupperman
Jackson Family Wines, California

As vice president of Oregon vineyard operations, Ken Kupperman oversees all aspects of vineyard and land management for Jackson Family Wines’ properties in Willamette Valley. 

After graduating from the University of Kansas with a bachelor’s degree in environmental studies he worked in Israel studying drip irrigation and gaining experience in the production of apples, pears and kiwifruit. Following this he received a master’s degree in horticulture from the University of Arkansas.


Jason Magnaghi
Figgins Family Wine Estates, Washington

Jason is the Viticulturist for Figgins Family Wine Estates in Walla Walla, Washington. Jason learned his love of farming while helping on the family farm growing row crops and working in a winery during the winter months. He began his career working in Vineyards after graduating from Washington State University with a degree in Horticulture. While working in the viticulture department at Chateau Ste. Michelle he was offered a position managing vineyards for the Figgins Family where he has been for 22 years.


David Ogilvie
Silt Wine Company, California

David is lead viticulturalist for his 4-generation farm, Wilson Farms, growing wine grapes in Clarksburg. In 2015 He also started a winery, Ogilvie Merwin Vintners, with his brother and friend that focuses on making premium wines from Clarksburg.

As farm manager, David has championed sustainability and efficiency using the latest Ag Tech. He leads the farming team managing vineyards as well as managing winemaking for his wine brands. In this way, David is able to follow the grape from its original planting all the way to bottling.

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