Pests & Diseases

The Napa County Agricultural Commissioner's Office is concerned about the introduction of new, exotic and destructive organisms. A significant exotic pest infestation could affect everyone in the county, through the loss of markets for farm products, increased pesticide usage and production costs. 

A comprehensive insect trapping program is facilitated by staff. Additionally, we conduct inspections of plants entering the county from throughout the state and across the country.

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Medfly Quarantine Lifted in Solano County

The California Department of Food and Agriculture (CDFA) announced August 6, 2018 that the Mediterranean Fruit Fly (Medfly) quarantine in Solano County has been lifted.  The quarantine was put in place following the detection of a female Medfly caught in a detection trap in the city of Fairfield by Solano County Agriculture Department staff in late August 2017.  

The lifting of the quarantine ends any restrictions on the movement of fruits and vegetables out of the established quarantine area within Solano County.  Fruits and vegetables are free to move to Napa County farmers markets.  Additionally, there are no restrictions for Solano County winegrape producers planning to transport fruit to Napa County wineries.  For additional information, you can read an article in Solano County’s Daily Republic.   

Sentinel Trapping Program

The sentinel trapping program targets pests not known to occur in the United States, or which may occur in a very limited distribution. These specific pests have not been found in Napa County, but their introduction would pose a serious threat to the wine grape industry. Early detection of significant pests could reduce crop losses and treatment costs. It could also help prevent the spread of these pests to additional counties, states or countries, minimizing the overall impact on trade and market distribution  

The wine grape pests that are being trapped for in our sentinel program include: Grape Berry Moth, European Grape Berry Moth, Grape Tortrix Moth, Honeydew Moth, Brown Marmorated Stink Bug, and Olive Moth. We currently have approximately 1200 sentinel traps placed throughout Napa County. This program is funded by the Napa County Wine Grape Pest and Disease Control District and the County of Napa.

General Trapping Program

The goal of the general trapping program is to detect the introduction of very specific pests within Napa County through the placement of traps using pheromones, food lures or visual attractors. Our insect trapping program routinely monitors for European Grapevine Moth, Glassy-winged Sharpshooter, Vine Mealybug, exotic fruit flies, Gypsy Moth, Japanese Beetle, and Western Grapeleaf Skeletonizer (PDF)(more information). For details on these pests to go the CDFA Pests and Disease page.

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