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The original item was published from 9/12/2023 2:36:00 PM to 11/22/2023 9:19:05 AM.

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Posted on: September 8, 2023

[ARCHIVED] Update to Oriental Fruit Fly (OFF)

Oriental Fruit Fly

A portion of Contra Costa County has been placed under quarantine for the oriental fruit fly following the detection of multiple oriental fruit flies (OFF). Twelve OFFs were detected near the cities of Brentwood and Oakley.  This has resulted in a quarantine zone covering 99 square miles, bordered on the north by the San Joaquin River; on the south by Marsh Creek State Park; on the west by Black Diamond Mines Regional Preserve; and on the east side by the Old River. A link to the quarantine maps may be found here:

To prevent the spread of oriental fruit flies through homegrown fruits and vegetables, residents living in the quarantine areas are urged not to move those items from their property. However, they may be consumed or processed (i.e., juiced, frozen, cooked, or ground in the garbage disposal) on the property where they were picked or disposed of by double bagging and placing them in the regular trash, not green waste.

Federal, state, and county agricultural officials work year-round, 365 days a year, to prevent, deter, detect, and eliminate the threat of invasive species and diseases that can damage or destroy our agricultural products and natural environment. These efforts are aimed at keeping California’s natural environment and food supply plentiful, safe, and pest-free.

See Press Release:

Find out the latest information on the California Department of Food and Agriculture (CDFA’s)  quarantine page:

Look up your address to see if you are in the quarantine.

Direct link to the map:

Learn more here:

Residents with questions about the project can call the Contra Costa County Agricultural Commissioner’s office at 925-608-6600 or the California Department of Food and Agriculture’s Pest Hotline at 1-800-491-1899.


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