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 Temecula GWSS monitoring

Since the last update, two rounds of trapping for GWSS have occurred. Over this period, GWSS activity has increased to levels approximately matching historic trap catch in the area In the February census a total of 26 GWSS adults were captured on 10 traps. In early March, the number captured increased to 31 GWSS adults...

Updated Temecula GWSS monitoring - early 2024

Since the last update, around Halloween, GWSS activity in the Temecula area has declined back down or slightly below where it typically is late in the year. Early 2024 counts also remain low Fortunately, as of early 2024, there's not much to see with respect to GWSS activity. Of the 106 traps that were recovered...

Temecula GWSS monitoring - Halloween edition

GWSS activity is up a bit since last time. 23 GWSS were captured on a total of 115 traps. Keep in mind that traps were out approximately twice as long, nearly a month, as earlier in the season. Some of this uptick is likely attributable to that longer deployment rather than a marked increase in...

Updated cooperative vineyard pest monitoring

GWSS captures are up slightly from a couple of weeks ago. However, this apparent increase in activity is solely attributable to one of the seven sites that reported counts All six GWSS captured were at this single site, on three of the 4 traps. As you can see in the lefthand map below, all other...

Updated Temecula GWSS monitoring

GWSS activity remained low despite the recent warm weather. Just 14 total GWSS were captured on a total of 115 traps. The secondary peak in activity that occurs in some years is clearly not happening this year Few GWSS captures were the norm throughout the area. Of the 11 traps capturing any sharpshooters, only 3...

Updated cooperative vineyard pest monitoring

GWSS captures are up slightly but still remain fairly low as is typical this time of year for most years. Records were reported for a total of 21 traps spread among 7 vineyards in Riverside and San Diego counties. Collectively, 5 GWSS were collected, which is consistent with the most recent Temecula GWSS areawide monitoring...

Updated Temecula GWSS monitoring

GWSS activity seems to be shutting down, which isn't too surprising given the (pleasantly) cool weather recently. Just 17 total GWSS were captured on a total of 115 traps. More of what's been a strange year, albeit a good one from the perspective of GWSS and PD - a very delayed start and somewhat early...

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...

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...

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...
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