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Grapevine Red Blotch Webinar


For Washington Growers

Three (3) WA pesticide credits have been approved for those attending the “live” viewing at WSU-IAREC.

You have two options for viewing this webinar:

  1.  WATCH THE WEBINAR “LIVE”: (No registration required). View the webinar at WSU-IAREC in Prosser, WA.  We will be projecting it in the Large Conference room. WSU Grape Virologist Naidu Rayapati will be present to respond to local questions and concerns. Light refreshments will be provided. SEMINAR WILL START at 12:30 pm PDST! For questions regarding this “live” viewing, please contact Michelle Moyer, WSU Viticulture Extension Specialist, at:
  2. WATCH THE WEBINAR FROM YOUR OFFICE: Preregistration for online viewing is required. To register, fill out the on-line form by 5 AM PST on Tuesday, March 26.  You will receive an email with connection instructions.  Register here:


Grapevine red blotch disease was first identified in 2008 as a syndrome that affects fruit ripening.  Virologists in New York and California have identified a graft-transmissible virus, called Grapevine red blotch-associated virus (GRBaV) that is associated with the symptoms.  Infected vines have been identified in California, New York, Virginia, Maryland, Pennsylvania, Texas and Washington.

Join Cornell University virologist Marc Fuchs, University of California Cooperative Extension Farm Advisor Rhonda Smith, and University of California-Davis Foundation Plant Services director Deborah Golino for an informational session on red blotch disease.  We will describe the virus, its impact on vine health, what informal field observations have told us, and what measures are being taken to test and identify infected vines and planting material.

  • GRBaV, its association with Red Blotch disease and presence in vineyards.  Marc Fuchs, Department of Plant Pathology and Plant Microbe Biology, Cornell University (with contributions from Mysore Sudarshana and Keith Perry).
  • An Extension Perspective: Field observations and impact on vines.  Rhonda Smith, UCCE Farm Advisor, Sonoma County.
  • Testing and identification of vines and planting material.  Deborah Golino, UC Davis Foundation Plant Services.

This webinar will be interactive. Bring your questions and submit them during the webinar via the ‘chat bar’. Tim Martinson, Senior Extension Associate, Cornell University, will moderate.