Oriental Fruit Fly Quarantine Expands in Northern California

New Quarantine Measures 123 Square Miles

News Release Edited By Patrick Cavanaugh

A portion of Sacramento and Yolo Counties have been placed under quarantine for the Oriental fruit fly following the detection of 15 flies in and around the southern part of the City of Sacramento near the Lemon Hill community.

The quarantine zone measure 123 square miles, generally bordered on the north by El Camino Avenue; on the south by Laguna Boulevard, on the west by the Sacramento River; and on the east by Bradshaw Road. A link to the quarantine map may be found here: https://www.cdfa.ca.gov/plant/off/regulation.html.

To prevent the spread of Oriental fruit flies through homegrown fruits and vegetables, residents living in the quarantine area 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 grown, or disposed of by double-bagging and placing in the regular trash bin, not green waste.

Following the principles of Integrated Pest Management (IPM), CDFA primarily uses the “male attractant” technique to eradicate this pest.  Trained workers squirt a small patch of fly attractant mixed with a very small dose of pesticide approximately 10 feet off the ground on street trees and similar surfaces; male fruit flies are attracted to the mixture and perish after consuming it. This approach has successfully eliminated dozens of fruit fly infestations from California over the last several decades.

The Oriental fruit fly is known to target 230 different fruit, vegetable, and plant commodities.  Damage occurs when the female fruit fly lays her eggs inside the fruit.

Small larvae generally enter the fruit at the stem end, although entry can be made anywhere on the fruit, particularly where two fruits touch. Larvae immediately bore to the center of the fruit and feed around the pit. After reaching maturity, they exit from the fruit and pupate.

While fruit flies and other invasive species that threaten California’s crops and natural environment are sometimes detected in agricultural areas, the vast majority are found in urban and suburban communities.

The most common pathway for these pests to enter the state is by “hitchhiking” in fruits and vegetables brought back illegally by travelers when they return from infested regions of the world or ship infested produce through the mail. Help protect California’s agricultural and natural resources; please Don’t Pack a Pest (www.dontpackapest.com) when traveling or mailing packages.

The Oriental fruit fly is widespread throughout much of the mainland of southern Asia and neighboring islands, including Sri Lanka and Taiwan, and it has invaded other areas, most notably Africa and Hawaii.

Residents with questions about the project may call CDFA’s Pest Hotline at 1-800-491-1899. Additional information may be found here: https://www.cdfa.ca.gov/plant/off/.

Oriental Fruit Fly Quarantine in Portion of Los Angeles County

A portion of Los Angeles County has been placed under quarantine for the oriental fruit fly (OFF) following the detection of nine adult OFF in an unincorporated area of Los Angeles County near the City of Inglewood.

The quarantine zone in Los Angeles County measures 81 square miles, bordered on the north by Avalon Boulevard; on the south by E Victoria Street; on the west by S La Cienga Boulevard; and on the east by California Avenue.  A link to the quarantine map may be found here: www.cdfa.ca.gov/plant/go/offq.

To prevent the spread of fruit flies through homegrown fruits and vegetables, residents living in the fruit fly quarantine area are urged not to move any fruits or vegetables from their property.  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.

To help prevent infestations, officials ask that residents do not bring or mail fresh fruit, vegetables, plants, or soil into California unless agricultural inspectors have cleared the shipment beforehand, as fruit flies and other pests can hide in a variety of produce.  It is important to cooperate with any quarantine restrictions and to allow authorized agricultural workers access to your property to inspect fruit and oriental fruit fly traps for signs of an infestation.

“Our system to detect invasive species like the oriental fruit fly is working well and according to design,” said CDFA Secretary Karen Ross.  “The key is to respond quickly and take action before the pests can spread.”

Following the principles of Integrated Pest Management (IPM), CDFA uses “male attractant” technique as the mainstay of its eradication effort for this pest.  This approach has successfully eliminated dozens of fruit fly infestations from California.  Trained workers squirt a small patch of fly attractant mixed with a very small dose of pesticide approximately 8-10 feet off the ground on street trees and similar surfaces; male fruit flies are attracted to the mixture and die after consuming it.

The male attractant treatment program is being carried out over several square miles surrounding the sites where the oriental fruit flies were trapped.  A map of the treatment area is available online at:  www.cdfa.ca.gov/plant/go/ffmaps-peps.

On or near properties where fruit flies have been detected, additional measures include removal of host fruits and vegetables, fruit cutting to detect any fly larvae that may be present, and treatment of host trees and plants with the organic-approved material spinosad.

The oriental fruit fly is known to target over 230 different fruit, vegetable, and plant commodities.  Damage occurs when the female fruit fly lays her eggs inside the fruit.  The eggs hatch into maggots and tunnel through the flesh of the fruit, making it unfit for consumption.

While fruit flies and other invasive species threaten California’s crops, the vast majority of them are detected in urban and suburban areas.  The most common pathway for these pests to enter the state is by “hitchhiking” in fruits and vegetables brought back illegally by travelers as they return from infested regions around the world or from packages of home grown produce sent to California.  The oriental fruit fly is widespread throughout much of the mainland of Southern Asia and neighboring islands including Sri Lanka and Taiwan.  It is also found in Hawaii.

Residents with questions about the project may call the department’s Pest Hotline at 1-800-491-1899.