California Department of Food and Agriculture

Pierce’s Disease Control Program Maps

Red Wedge Areawide Trapping

(Coachella, Fresno, Kern, Madera, Temecula, Tulare)

Areawide Trapping

GIS is used as a decision support tool in the area wide management of glassy-winged sharpshooter (GWSS) in California. Traps are located using GIS/GPS, and then serviced using portable data terminals. Trapping data is uploaded to a central server, allowing area wide managers to determine GWSS hotspots over large areas in Fresno, Kern, Madera, Riverside, and Tulare counties. Bi-weekly maps show where GWSS have been found in single cycles of trap servicing, with the prior year also listed as a comparison.

Infested Areas

These are areas subject to program regulations because of the presence of the glassy-winged sharpshooter. There are overviews of current and eradicated infested areas throughout the state, and maps that are designed to clearly show the boundaries of the infested areas for the partially infested counties.

Pierce's Disease Distribution by County

Map (above right) is based on finding one or more locations within a county where grapevines are exhibiting the symptoms of Pierce's Disease(PD). The symptoms are associated with the presence of Xylella fastidiosa in the plant. The strain of X. fastidiosa that causes PD may be present in other counties, but if no infected and symptomatic grapevines have been reported to CDFA, then PD will not be reported from that county. Also, indicating that PD is "present" in a county does not indicate how extensive the distribution or damage from PD is in that county.