Dec. 16 Northern Grapes Project Webinar

The Northern Grapes Project Webinar Series

“Stuck on You – Sulfur Spray Residues in the Vineyard and Winery”

Chris Gerling                     Gavin Sacks                      Jillian Jastrzembski

Tuesday, December 16th, 2014

12:00 Noon Eastern (11:00 am Central)

7:00 pm Eastern (6:00 pm Central)

Chris Gerling, Gavin Sacks, and Jillian Jastrzembski of Cornell University are teaming up to bring you this webinar on sulfur residues. In addition to must nutritional deficiencies, yeast metabolism of elemental sulfur (S) residues represents a well-understood pathway for formation of hydrogen sulfide (H2S, “rotten egg” aroma) during fermentation. Although S sprays are widely used for controlling powdery mildew, wine grape growers are often encouraged to avoid S-sprays near harvest as a point of caution to decrease the potential risk of excess H2S formation. This webinar will review i) recommendations for maximum S residues pre-fermentation, ii) winery-appropriate methods for S-residue measurement, and ii) the effects of spray formulation/rate, spray cessation date, and post-harvest decisions (e.g. skin contact, clarification) on S-residues. Recent data indicating a correlation between S-spray residues and formation of H2S post-bottling will also be discussed.

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 Friday, December 12th.

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.

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)