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.


2021 Pierce's Disease Research Symposium

Date: December 14 - 15, 2021
Time: 8:30 AM - 4:00 PM
Location: Virtual

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PD/GWSS Board Research and Outreach Program Request for Proposals

Proposals accepted December 1, 2021 through January 31, 2022.
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PD/GWSS Board and PD Advisory Task Force Meeting

Date: January 24, 2022
Time: 10:00 AM
Location: California Association of Winegrape Growers
1121 L Street, Suite 304
Sacramento, CA 95814
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Where to go from here

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