Dr. Jim Willwerth

Dr. Jim Willwerth

Dr. Jim Willwerth
CCOVI Scientist

Cool Climate Oenology and Viticulture Institute, Brock University
St. Catharines, ON L2S 3A1
Email: jwillwerth@brocku.ca
Phone: 905 688 5550 ext. 5477
Fax: 905 688 3104
Office: IH308, Lab: H220

EDUCATION

  • Ph.D. (2011) – Biological Sciences: Plant Sciences; Oenology and Viticulture, Brock University
  • Cert. Grape & Wine Tech. (2004) – Brock University
  • B.Sc. (2001) – Biology, St. Mary’s University, Halifax, NS. Canada
     

RESEARCH
Grapevine cold hardiness, freeze protection, terroir-based wine quality, soil-water-vine relations, precision viticulture/unmanned aerial vehicles (UAVs), impact of terroir and viticulture practices on sensory profiles of wine, bird detterents
 

Selected Research Projects

Optimizing cold tolerance in V. vinifera cultivars through cultural practices

Use of geotextiles to reduce freeze injury in grapevines

Understanding cold hardiness dynamics of grapevine cultivars in Ontario

Use of unmanned aerial vehicles (UAVs) in vineyards

Assessing bird activity, bird damage and use of new bird deterrents in vineyards

 

SELECTED OUTREACH PROJECTS
VineAlert: Grapevine management and monitoring system for cold hardiness and injury
Grape Pre-harvest Monitoring Program
 

TEACHING
OEVI 2P45 – Grapevine Cultural Practices (Sessional Instructor)

OEVI 2P99 - Grapevine Biology (Guest Lecturer)
 

SELECTED PUBLICATION AND PRESENTATIONS
Publications

  • Willwerth, J.J. (2011). Delineation of Within-site Terroir Effects using Soil and Vine Water Measurements in Riesling Vineyards within the Niagara Peninsula. PhD Thesis. Brock University, Canada. Read
  • Willwerth, J.J, Reynolds, A.G. and Lesschaeve, I. (2010). Terroir Factors: Their Impact in the Vineyard and on the Sensory Profiles of Riesling Wines. Les Facteurs du Terroir: Leur Impact dans le Vignoble et sur le Profil Sensoriel de vins de Riesling. Prog. Agric. Vitic. 8:159-168.
  • Reynolds, A.G., de Savigny, C. and Willwerth, J. (2010). Riesling Terroir in Ontario Vineyards. The Roles of Soil Texture, Vine Size and Vine Water Status. Prog. Agric. Vitic. 10:212-222.
  • Reynolds, A.G., Schlosser J., Power, R., Roberts, R., Willwerth, J. and de Savigny, C. (2007). Magnitude and Interaction of Viticultural and Enological Effects. I. Impact of Canopy Management and Yeast Strain on Sensory and Chemical Composition of Chardonnay Musque. Am. J. Enol. Vitic. 58:12-24.
  • Reynolds, A.G., Schlosser, J., Sorokowsky, D., Roberts, R., Willwerth, J. and de Savigny, C. (2007). Magnitude and Interaction of Viticultural and Enological Effects. II. Relative Impacts of Cluster Thinning and Yeast Strain on Composition and Sensory Attributes of Chardonnay Musque. Am. J. Enol. Vitic. 58:25-41.

Conference Proceedings

Reynolds, A.G., Di Profio, F., Hakimi Rezaei, J., Jasinski, M. and J.J. Willwerth (2013). A hierarchal terroir model for Great Lakes viticulture. 18th International Symposium GiESCO 2013, Porto, Portugal, July 7-11, 2013, 976-986.

Willwerth, J., Reynolds, A.G. and Lesschaeve, I. (2009). Terroir Factors: Their Impact in the Vineyard and on the Sensory Profiles of Riesling Wines. Proc. 16th International GIESCO 2009 Symposium, Davis, California USA, 12-15 July, 2009, pp. 13-18.

Reynolds, A.G., de Savigny, C., Willwerth, J. and Brown, R. (2009). Riesling Terroir in Ontario Vineyards. The Roles of Soil Texture, Vine Size and Vine Water Status. Proc. 16th International GIESCO Symposium, Davis, California USA, 12-15 July, 2009, pp. 589-598.

Reynolds, A.G., de Savigny, C., Willwerth, J. and Brown, R. (2007). Riesling Terroir in Ontario Vineyards. The Possible Roles of Soil Texture, Vine Size and Vine Water Status. Proc. Bacchus at Brock International Wine Conference. Brock University, Ontario, Canada, 7-9 June, 2007. Brock University Press.

 

Conference Proceedings, Posters, Abstracts, Presented Papers, etc.

 

  • Willwerth, J., Jasinski, M. and Dowling, L. (2014). Impact of Cultural Practices on Cold Hardiness Dynamics of six V. vinifera cultivars. American Society for Enology and Viticulture. Austin, TX.  
  • Ker, K.W., Willwerth, J. and Brewster, R.(2013). Growing Season Weather Impact on Vine Hardiness. 38th Annual Meeting American Society for Enology and Viticulture/Eastern Section, Winston-Salem, NC. 15-18 July, 2013, Am. J. Enol. Vitic. 64:416-424A. 
  • Willwerth, J. (2012). Understanding Key Factors Affecting Cold Hardiness in Ontario: Optimization of Cold Tolerance and Reduction of Cold Injury in Grapevines. 39th Annual Conference of the Plant Growth Regulation Society of America. Denver, CO. 22-26 July, 2012. 
  • Ker, K.W., Brewster, R., Willwerth, J. and Inglis, D. (2012) Climatic Influences on Vine Hardiness – Vine Assessments and Use of Protection Practices. 8th International Cool Climate Symposium, Hobart Tasmania. 31 January-4 February, 2012. 
  • Mussell, A., Willwerth, J. and Fisher, H (2011). Grape varieties in Ontario wine regions: Understanding the potentials and the risks. December 2011.
  • Willwerth, J., Reynolds, A.G. and Lesschaeve, I. (2010). Vine Water Status and Its Influence on the Sensory Characteristics of Riesling Wines. 35th Annual Meeting American Society for Enology and Viticulture/Eastern Section, Geneva, NY. 12-15 July, 2010, Am. J. Enol. Vitic. 61:566-567A.
  • Willwerth, J., Reynolds, A.G. (2010). The ‘Dirt’ on Niagara Terroir. Viticulture 2010. Rochester, New York, USA. 16-19 February, 2010. (Invited)
  • Willwerth, J., Reynolds, A.G. and Lesschaeve, I. (2008). Water Status and Terroir in Riesling and Niagara. 33rd Annual Meeting American Society for Enology and Viticulture/Eastern Section, St. Catharines, ON, Canada. 14-16 July, 2008. (Invited)
  • Willwerth, J.J., Reynolds, A.G. and Lesschaeve, I. (2008). Sensory Profiles of Riesling Wines from Sub-Appellations Within the Niagara Peninsula. 33rd Annual Meeting American Society for Enology and Viticulture/Eastern Section, St. Catharines, ON, Canada. 14-16 July, 2008
  • Willwerth, J.J., Reynolds, A.G. and Lesschaeve, I. (2008). Impact of Vine Water Status on the Sensory Profile of Riesling Wines. 59th Annual Meeting American Society for Enology and Viticulture, Portland, OR, USA, 17-20 June, 2008, Am. J. Enol. Vitic. 59:349A.
  • Willwerth, J.J., Reynolds, A.G. and Lesschaeve, I. (2008). Vine Water Status: Its Role in the Vineyard and its Impact on Riesling Wine Sensory Attributes. Virginia Vineyards Association Winter Technical Meeting, Charlottesville, Virginia, U.S.A., 7-9 February, 2008. (Invited)
  • Willwerth, J.J., Reynolds, A.G. and Lesschaeve, I. (2007). The Significance of Water Status as a Determinant of Terroir in Riesling Vineyards. Proc. Bacchus at Brock International Wine Conference. Brock University, Ontario, Canada, 7-9 June, 2007. Brock University Press. (Winner; Best Poster: Science Category)
  • Reynolds, A.G., Wardle, D.A., Schlosser, J., Power, R., Sorokowsky, D. and Willwerth, J. (2007). Vineyard and Winery Management to Enhance Flavor Quality of Aromatic White Varieties Proc. Viticulture 2007, Rochester, New York, 6-8 February, 2007 pp 94-96.

 

Presented Papers, Seminars, Workshops, Reports

Willwerth, J. (2014). Vineyard practices and their impact on cold hardiness and bud survival. Essex County Associated Growers’ 64th South West Horticulture Expo, 18-19 November, Leamington, ON. Canada.

Willwerth, J., Ker, K., and Inglis, D. (2014).  Best Management practices for reducing winter injury in Grapevines.  (Submitted to Ontario Grape and Wine Research Inc. September 2014).

Willwerth, J. (2014). Assessments of bird activity, bird damage and use of a new bird deterrent in vineyards within the Niagara Peninsula, Ontario. (Submitted to the Grape Growers of Ontario for Industry Support Component (ISC) project from Ontario Vineyard Improvement Program).

Willwerth, J. (2014). Protecting vineyards using large data sets:  VineAlert and monitoring cold tolerance in grapevines.  Data Analytics for the wine and tree fruit growing industries. 29 March, Acadia University, Wolfville, NS. Canada (keynote speaker).

Willwerth, J. (2014). Grapevine cold hardiness: Current issues and research developments. CCOVI Lecture Series. 10 March, 2014. Brock University, St. Catharines, ON. Canada.
 
Willwerth, J. (2014). Precision viticulture and use of unmanned aerial vehicles (UAVs) in vineyards. Eastern Winery Exposition. 4-5 March, Lancaster, PA. USA.
 
Willwerth, J. (2014). Recovering from Cold Symptoms: Grapevine Cold Hardiness and Mitigating the Effects of Freeze Injury. Ontario Fruit and Vegetable Conference. 19-20 February. Niagara Falls, ON. Canada.
 
Willwerth, J. (2013). Use of geotextiles to protect Ontario vineyards from freeze injury. (Submitted to the Grape Growers of Ontario for Industry Support Component (ISC) project from Ontario Vineyard Improvement Program).
 
Willwerth, J. (2013). Overview of Canopy Management for Quality Wine Production. 63rd South West Horticulture Expo. 19-20 November. Leamington, ON. Canada.
 
Willwerth, J. (2013). Wine Island’s Grower Association 11th Annual Oenology and Viticulture Conference. 11-12 July, Duncan, British Columbia. Canada (invited).
 
Willwerth, J. (2013). Getting Through the Winter: Updates on Freeze Protection and Cold Hardiness Research Beating the Cold. Best Viticulture Practices to Maximum Vine Hardiness. CCOVI Lecture Series. 10 April, 2013. Brock University, St. Catharines, ON. Canada.
 
Willwerth, J. and Ker. K. (2013). Calibrate Your Vineyard: Pruning workshop. 24 January, 2013.  Brock University, St. Catharines, ON. Canada.

Willwerth, J. (2012). Beating the Cold. Best Viticulture Practices to Maximum Vine Hardiness. CCOVI Lecture Series. 28 March, 2012. Brock University, St. Catharines, ON. Canada.

 Willwerth, J. (2011). Managing Acidity in the Vineyard. VQA Winemaker’s Forum: From Vine to Wine – Methods and trials on dealing with high acid varietals. 26 May, 2011. Brock University, St. Catharines, ON. Canada.

Willwerth, J. (2011). How to Overcome the Cold? An Overview of Grapevine Winter Hardiness and New Grape Varieties Suitable for Cold Climate Regions. Quebec Workshop for Wine and Vine. 11 April, 2011. Brome-Mississquoi, QC. Canada.

Willwerth, J. (2011). Coming out of the Cold: The State of the Vine. CCOVI Lecture Series. 9 March, 2011. Brock University, St. Catharines, ON. Canada.

Willwerth, J. (2011). VineAlert and New Vineyard Research/Outreach Projects at CCOVI. Ontario Fruit and Vegetable Grower Association Convention. 23-24 February, 2011. Brock University, St. Catharines, ON. Canada. (Invited)

Willwerth, J. (2011). Understanding Factors Impacting Cold Hardiness and VineAlert: An Advanced Cold Hardiness Database. Grapevine Winter Hardiness and Research Update Symposium for Nova Scotia Grape Growers and Winemakers, 1-2 February, 2011. St. Catharines, ON. Canada.

Willwerth, J. (2010). Vineyard Management Practices and their Influence on Cold Hardiness. Essex County Growers Association Annual Meeting. 24 November, 2010. Leamington, ON. Canada. (Invited)

Willwerth, J. (2009). Defining Terroir in the Niagara Peninsula. Dept. of Horticultural Sciences, Cornell University Seminar Series, Geneva, NY. 7 Oct, 2009. (Invited)

Willwerth, J. (2008). Riesling and Terroir in the Niagara Peninsula. 1st International Riesling Experience, St. Catharines, ON, Canada, 17 July, 2008. (Invited)

Willwerth, J. (2007). Plant Materials for Viticulture. Rootstocks and Scions: Where, Why and How to Plant. Independent Wine Education Guild Seminar. 21 August, 2007. Brock University, St. Catharines, ON. Canada.

Reynolds, A.G., Willwerth, J., Hakimi, J., et al. (2006). Determining the Basis for Vineyard Terroir Using Spatial Variation in Vine Vigor, Water Stress, and Soil Texture. Proc. Terroir 2006: A Dialogue Between Earth Scientists and Winemakers. 19-22 March, 2006. University of California, Davis, USA.

 

Dr. Jim Willwerth
Dr. Jim Willwerth

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