UCCE Sonoma County
University of California
UCCE Sonoma County

TAP for Red Blotch - Details

Vine loss due to Red Blotch is now eligible for USDA Farm Service Agency's Tree Assistance Program (TAP). Site inspection is required before pulling the vines. Contact local FSA office to file. 707-664-8593 or Lisa.velasquez@ca.usda.gov

TAP for Losses due to Grapevine Red Blotch 

Approved Plant Disease for California

1 Approved Disease – Grapevine Red Blotch-associated Virus (GRBaV) The STC has approved Grapevine Red Blotch-associated Virus (GRBaV), commonly referred to as “Red Blotch”, as an eligible plant disease for select counties in California.

A  Area of Approval Grapevine Red Blotch-associated Virus (GRBaV) is approved for the following counties:

  • Amador
  • Contra Costa
  • El Dorado
  • Fresno
  • Marin
  • Mendocino
  • Monterey
  • Napa
  • Riverside
  • Sacramento
  • San Joaquin
  • San Luis Obispo
  • San Mateo
  • Santa Barbara
  • Santa Cruz
  • Solano
  • Sonoma
  • Yolo

B  Verification A claim of loss due to Grapevine Red Blotch-associated Virus (GRBaV) must be verified through polymerase chain reaction (PCR) testing performed at a commercial laboratory.

  • A minimum of 10 symptomatic vines must be tested from each block claimed to be infected. This sampling, coupled with visual indicators identifiable to the FSA representative will be used to determine the extent of damage.
  • Visual indicators may include, but are not limited to:

o   In red varieties: Reddening of the underside secondary/ tertiary veins, red blotches on leaves

o   In white varieties: Very pale yellow blotches and irregular chlorosis

Note: FSA Representative shall clearly document observations of specific symptoms and specify areas observed in the producers program file. 

  • Visual inspection requirement of claimed infected plants is waived for plants removed prior to September 10, 2014.



University of California Cooperative Extension, Sonoma County
133 Aviation Blvd Suite 109, Santa Rosa, CA 95403  Phone: 707.565.2621  Fax: 707.565.2623
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