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Sharpshooters & Pierce's disease in Southern California

Department of Entomology

glassy winged sharp-shooter
Sharpshooters & Pierce's disease

The purpose of this site is to provide information on the biology and management of sharpshooters and Pierce's disease, with a focus on Southern California vineyards and surrounding areas.

The blog will be used to post regular updates on the results of the Temecula glassy-winged sharpshooter areawide monitoring program and to occasionally share other information relevant to sharpshooters, Xylella fastidiosa, or Pierce's disease.

For more information, contact Matt Daugherty (matt.daugherty@ucr.edu; 951-827-2246)

Updated cooperative vineyard pest monitoring

GWSS records were reported for a total of 33 traps spread among 8 vineyards in Riverside and San Diego counties. Collectively, just 3 GWSS were collected, which remains a far lower per trap catch than in the most recent Temecula GWSS areawide monitoring (red line) The map on the left, below, shows the distribution of...

Scouting for Pierce's disease

Although things are busy this time of the year with harvest, it is also a good time to keep an eye out for Pierce's disease. Symptoms are strongest this time of year. Try to set aside some time to scout the vineyard as time allows and flag suspected diseased vines for later removal. The following...

Updated Temecula GWSS monitoring

GWSS activity dropped down to where it is at this time of year in an average year. A total of 76 adults were caught among the 115 traps. GWSS activity this time of year is not as important with respect to spreading chronic Pierce's disease. Nonetheless, given the cooler weather we'll hopefully continue to see...

Cooperative vineyard pest monitoring

In addition to the continuing monitoring of GWSS in commercial vineyards in the Temecula area, a cooperative pest monitoring project was recently initiated, using grower- supplied trap counts. Ultimately this will include information on glassy-winged sharpshooter, western grapeleaf skeletonizer (WGLS; Harrisina brillians), and vine mealybug (VMB; Planococcus ficus) - from primarily small growers in areas...

Temecula GWSS monitoring

GWSS activity remained high, with a total of 108 GWSS caught among the 115 traps. It is somewhat reassuring that we did not see an increase from the last round, as it suggests GWSS populations may soon be on the downturn after a much delayed start to the year. Whether that holds true should be...

Updates on GWSS monitoring in Temecula

As noted, the Temecula GWSS Areawide Monitoring Program formally wound down in June. Fortunately, the winegrape industry has initiated an analogous monitoring program with funding provided by the Temecula Valley Winegrowers Association. Ultimately, the hope is to establish an online data dashboard with real-time monitoring information and notes to keep growers apprised of relevant issues...

GWSS newsletter 6-21-2023

GWSS newsletter 6-7-2023

GWSS newsletter 5-22-2023

Temecula GWSS Areawide Program is Winding Down

Please note that the Temecula GWSS areawide monitoring will be wrapping up after June 2023. This program has been administered by the CDFA with funding from the USDA for more than 20 years, the goal of which was to support broad-scale monitoring of GWSS populations in the region to guide vineyard pest management decisions. In...

GWSS newsletter 5-10-2023

GWSS newsletter 4-12-2023

GWSS newsletter 3-8-2023

GWSS newsletter 2-8-2023

GWSS newsletter 1-10-2023

GWSS newsletter 12-7-2022

GWSS newsletter 11-16-2022

GWSS newsletter 10-19-2022

GWSS newsletter 10-5-2022

GWSS newsletter 9-21-2022

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