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Stop the Spread: Effective Options for Managing Leafroll

January 24, 2023 - January 25, 2023

Dates and Locations

  • Tuesday, January 24, 2023 – Walla Walla, WA (Hampton Inn, 1531 Kelly Place, Walla Walla)
  • Wednesday, January 25, 2023 – Prosser, WA   (The Clore Center, 2140A Wine Country Rd, Prosser)

Registration Information

  • Preregistration is now closed. Walk-ins are welcome until meeting space capacity is met.
    • WALLA WALLA – Tuesday, January 24
    • PROSSER – Wednesday, January 25
  • Approved for 3 WSDA Pesticide Recertification Credits
  • Approved for 3 ODA Pesticide Recertification Credits
  • Refreshments will be provided.

Agenda (For Both Days)

9:00 am          Check In

9:15 am          Presentation: “Grapevine leafroll disease management: obstacles and opportunities.”

Grapevine leafroll disease is one of the most devastating viral diseases of grapevine worldwide. Management involves an integrated approach that includes the selection of clean planting material, vector detection and management, and removal of diseased vines to reduce viral inoculum. This talk will focus on the process of integrating these tools into a successful disease management program to reduce economic and environmental impacts of leafroll disease. It will also cover grape mealybug biology and management, leafroll disease transmission biology, ecology, and decision support tools, and management including clean plants, vine mapping, and approaches for roguing.

Presenter: Dr. Monica Cooper, University of California Cooperative Extension, Napa County Viticulture Advisor. Presenter profile:

10:15 am        Presentation: “Grapevine leafroll in Washington State.”

This presentation will cover general features of leafroll disease in WA vineyards. Topics include leafroll viruses and their prevalence, disease symptoms in red- and white-fruited cultivars, challenges in vineyard scouting and symptom-based diagnosis of leafroll disease, sampling for virus testing, the importance of diagnostics in disease management, vector(s) and spatial and temporal spread of leafroll in vineyards.

Presenter: Dr. Naidu Rayapati, Washington State University, Grape Virologist. Presenter profile:

10:45 am        Refreshment Break

11:00 am        Group Discussion: Cooperative Regional IPM Groups

In this guided group discussion, participants will be able to ask questions regarding managing grapevine leafroll, and how to develop neighbor-based integrated pest management groups. Peers will share their ideas and approaches for developing local and regional grower partnerships to facilitate the formation and management of these IPM groups.

Facilitators – Dr. Monica Cooper, and Dr. Michelle Moyer, Washington State University, Viticulture Extension Specialist. Presenter profile:

12:00 pm        Closing remarks, surveys, pesticide credit sign-up


This event is co-presented by WSU Viticulture Extension and the Washington Wine Industry Foundation, with funding provided by the WSDA-Specialty Crop Block Grant #K3950 titled “Stop the Spread: Building Pest Management Plans to Comply with Grape Quarantine Rules”


Anyone attending this program who requires auxiliary aids or services, please contact Michelle Moyer at 509-786-9234 or Extension programs and employment are available to all without discrimination. Evidence of noncompliance may be reported through your local Extension office.