Cathy Roache
County Agricultural Commissioner / Sealer
Agriculture / Weights & Measures

Mediterranean Fruit Fly Quarantine Resources


Alameda County is under quarantine in the Fremont and South Newark Area. To prevent the spread of invasive fruit flies through homegrown fruits and vegetables, residents living in the invasive fruit fly quarantine areas are urged not to move any fruits and vegetables from their properties. Fruits and vegetables may be consumed or processed (i.e., juiced, frozen, cooked, or ground in the garbage disposal) at the property where they were picked. If they are not consumed or processed, please dispose of them by double- bagging in plastic bags and put the bags in the garbage bin for collection, not green waste.

Am I in the Quarantine Zone?

If you are growing or planning to move any hosts, click on the link and type in your address to see if you are within the quarantine zone (Mediterranean Fruit Fly Interactive Quarantine Map) If you live in the quarantine area, backyard fruits and vegetables can spread invasive fruit flies and may not be moved from the premises where they are grown.

What type of treatments are being used?

Sterile insect technique is used to eradicate Medflies. Sterile male medflies are released via specialized aircraft and trucks in the project area to disrupt the natural Medfly mating cycle, sterile males mate with wild females which results in no viable offspring. Upon release of sterile male medflies, residents may see fruit flies around their property. Staff are also inspecting host fruits and vegetables in these areas for the presence of larvae. Finally, host fruit removal will occur within 100 meters of properties with larval detections and/or mated female detections.

What fruits or produce are hosts for the Mediterranean Fruit Fly?

Host List

Mediterranean Fruit Fly Brochure

Cover of Mediterranean Fruit Fly brochure

Frequently Asked Questions for Residents (FAQs)