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Update on GWSS/Pierce’s Disease Nursery Programs

Over half of the state’s nurseries are in counties infested with the glassy-winged sharpshooter, and many ship to non-infested areas. Inspections, trapping, and treatments at nurseries, led by the Pierce’s Disease Control Program, are key to keeping GWSS from infesting new areas. Nursery Regulatory Program: From Jan. 1 through July 31, 2023, there were 20,250 nursery stock shipments to non-infested areas of the state. Origin county inspectors found 13 GWSS egg masses, five nymphs, and five adults in outgoing nursery stock shipments. Destination county inspectors found one viable GWSS life stage during incoming nursery stock inspections, resulting in a Notice of Rejection. Nursery Stock Approved Treatment Program (ATP): From Jan. 1 through July 31, 2023, there were 5,108 ATP shipments, consisting of 975,613 plants. No regulatory actions have been taken against any ATP nurseries for viable life stages so far this year.