Pierce's Disease
Research Updates


What is Pierce's Disease?

Pierce's Disease is a bacterial infection, which is spread by bugs that feed on grapevines, particularly the "glassy winged sharpshooter." Grapevines that become infected with PD can quickly become sick and die.

glassy-winged sharpshooter

About Pierce's Disease

Pierce's Disease is a deadly disease of grapevines. It is caused by the bacterium Xylella fastidiosa, which is spread by xylem feeding leafhoppers known as sharpshooters. Pierce's Disease is known to be prevalent within the USA from Florida to California, and outside the USA in Central and South America. Xylella fastidiosa works by blocking the xylem, which conducts the water around the plant. Symptoms include chlorosis and scorching of leaves, and entire vines will die after 1-5 years. Pierce's Disease is less prevalent where winter temperatures are cold, such as more northern areas, high altitudes and inland areas.


PD/GWSS Board Now Accepting Research and Outreach Proposals

The annual Request for Proposals is now open. Apply here.
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PD/GWSS Board and PD Advisory Task Force Meeting

Date: January 22, 2024
Time: 1:00 PM
Location: CDFA Headquarters Auditorium, 1220 N Street, Sacramento, CA 95814
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Where to go from here

  • Apply for Grants

    Read the PD/GWSS Board’s Request for Proposals and apply.

  • Resources

    Find a variety of sources with information on Pierce's Disease, as well as information on funding agencies.

  • Search

    Search the online resources for information related to Pierce's Disease.