March 21, 2014- The Northern Grapes Project Webinar Series
“Impact of crop load and training systems on viticultural and enological performances of Marquette and Frontenac grown in Michigan and New York”
April 8th, 2014
12:00 Noon Eastern (11:00 am Central)
7:00 pm Eastern (6:00 pm Central)
Tim Martinson of Cornell University and Paolo Sabbatini of Michigan State University will discuss results from vineyard trials conducted as part of the Northern Grapes Project. In New York, two years of training system trials on Marquette and Frontenac indicated that high training systems (Top Wire Cordon and Umbrella Kniffin) produced up to twice the yield with less labor inputs than Vertical Shoot Positioning. Fruit composition indices show modest reduction in soluble solids, but little impact on titratable acidity or juice pH. Individual sunlight-exposed Frontenac clusters had higher brix and lower titratable acidity than shaded clusters, across all training systems. In Michigan, training system (Top Wire Cordon, Geneva Double Curtain, and the experimental Moving Trellis) and crop load (cluster thinning) trials were conducted on Marquette. Spring frosts in 2012 impacted results and fruit chemistry was very good overall. In 2013, crop load studies indicated a large impact of cluster thinning on canopy growth and architecture. Despite the large difference in yield, minimal impact was observed on fruit chemistry.
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Further Northern Grapes Project information is available on-line at
The Northern Grapes Project is funded by the USDA’s Specialty Crops Research Initiative Program of the National Institute for Food and Agriculture, Project #2011-51181-30850 and through the New York State Specialty Crops Block Program.
Chrislyn A. Particka, PhD
Extension Support Specialist
Department of Horticultural Sciences
630 W. North Street
Geneva, NY 14456