United States Department of AgricultureAnimal and Plant Health Inspection Service

Plant Protection and Quarantine

United States Department of AgricultureAnimal and Plant Health Inspection Service

Plant Protection and Quarantine

Beth Stone-SmithUSDA APHIS PPQ WR

GWSS Program DirectorBakersfield, CA

Areawide Suppressionof the Glassy-winged

Sharpshooter

Areawide Suppression

• What?

• Why?

• Where?

• How?

• Results

What?

• Applying pesticide treatments, across a large geographically defined area, in order to significantly reduce pest populations.

Why?

• To reduce current GWSS population levels - reduce natural and artificial spread of GWSS, reduce incidence of PD

+ =

Where?

• GWSS Infested areas of California where commercial citrus production interfaces with grapes

• Kern, Riverside, and Tulare Counties

How?

• Treatments targeted in citrus

• Treat based on trap finds, plus treat adjacent citrus

• Coordinated and effective timing of treatments

• Fall foliar

• Spring imidacloprid

• Sticky traps on ¼ mile grid

• Monitor GWSS populations throughout the year

Challenges to the How?

• Diverse agricultural system

• Polyphagous insect pest

• Existing IPM strategies

• Organic treatments

• Urban interface

• Funding

Tulare County

• 66,300 acres of grapes

• 118,000 acres of citrus, ½ of which considered infested

• 5,122 traps

2004

Tulare County

Tulare County

2005

Tulare County

2008

Tulare County GWSS

Tulare CountyGWSS Trapping Summary

Year GWSS Total Count

2003 48,639

2004 9,721

2005 1,043

2006 2,974

2007 2,536

2008 1,327

United States Department of AgricultureAnimal and Plant Health Inspection Service

Plant Protection and Quarantine

United States Department of AgricultureAnimal and Plant Health Inspection Service

Plant Protection and Quarantine

USDA APHISUSDA APHISCDFACDFA

Treatment Treatment CoordinatorsCoordinators

County Departments of County Departments of AgAg

Industry GroupsIndustry GroupsGrowersGrowers

USDA ARSUSDA ARSUCUC

The The TeamTeam