Research, Innovation, Action


Dear California Winegrape Growers,

In the face of increasing risks of invasive pests and diseases from around the world, you and your fellow growers can turn to the innovative grower-government partnership created almost two decades ago to help protect California’s vineyards. The research, outreach, and other activities funded by growers and directed by the Pierce’s Disease and Glassy-Winged Sharpshooter (PD/GWSS) Board are all geared toward safeguarding your California winegrapes.

Projects funded by the PD/GWSS Board are showing promising results. Five PD-resistant winegrapes were recently released, various control methods are headed towards commercialization, and research continues to search for practical and sustainable solutions to PD, GWSS, and other serious winegrape pests and diseases. Through it all, the PD/GWSS Board, guided by winegrape growers and vintners from around the state, strives to ensure assessment funds are spent wisely and productively.

Quick action is essential for addressing emerging threats. The PD/GWSS Board and winegrape grower assessment give the industry the ability to respond rapidly, without the need for additional legislation or other delays. This puts key decisions for funding research and outreach directly in the hands of the growers, who have supported vital research and outreach on other pests and diseases of winegrapes, including:

  • Brown marmorated stink bug

  • European grapevine moth

  • Grapevine fanleaf disease

  • Grapevine leafroll disease

  • Grapevine red blotch disease

  • Mealybug pests of winegrapes

Congratulations on your foresight and commitment to safeguarding your industry. With that in mind, we are pleased to present you with the "Research, Innovation, Action" brochure highlighting the progress made in the past two decades against pests and diseases threatening California’s vineyards.


Karen Ross, Secretary

California Department of Food and Agriculture

Roger Spencer, Statewide Coordinator

Pierce's Disease Control Program

California Department of Food and Agricu