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.

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.


2016 Pierce's Disease Research Symposium

Date: December 13 and 14, 2016
Location: San Diego, California
More information will be available soon

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Upcoming PD/GWSS Board and Advisory Task Force Meeting

Date: October 24, 2016
Time: 10:00 AM
Location: Fresno County Department of Agriculture, 1720 South Maple Avenue, Fresno, California, in the Demo Room in Building 400.

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