April 8th Northern Grapes Webinar

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.

Registration is NOT required if you received this email directly from Chrislyn Particka, as it means that you are a member of the Northern Grapes Webinar mailing list.

All members of the Northern Grapes Webinar mailing list will receive an email the Monday before the webinar containing the web address (URL) for both webinar sessions as well as connection instructions.

If you have received this email from someone other than Chrislyn Particka, you need to register via the link below:


Registering for one Northern Grapes Webinar will place you on the mailing list, and you will receive announcements and connection instruction for all further Northern Grapes Webinars.

Registration will close at 8 am (Eastern) on Monday, April 7th.

Feel free to email Chrislyn Particka (cap297) with any questions, if you want to check your registration status, or if you’d like to be removed from the Northern Grapes Webinar mailing list.

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

Cornell University

Department of Horticultural Sciences

630 W. North Street

Geneva, NY 14456


315-787-2449 (desk)

315-787-2216 (fax)