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Cherry fruit fly regulations
Western cherry fruit fly (CFF), Rhagoletis indifferens, is a destructive insect pest of cherry fruit (Prunus species). Damage occurs as CFF larvae bore into and feed on the fleshy portions of fruit. R. indifferens has been reported in the Pacific Northwest since the early 1900s. It is now known to occur in the following states and provinces of North America: California, Idaho, Montana, Oregon, Utah, Washington, Wyoming, and British Columbia.
The fruit industry has experienced economic losses from CFF due to unmarketable crops. Controlling or eradicating the insect by quarantines has been instrumental in assisting the cherry growing industries.

Control areas counties in Oregon
To protect the cherry industry, the Oregon Department of Agriculture (ODA) has developed ‘control areas’ for CFF in certain regions in Oregon where commercial cherries are produced. CFF control areas have been created to assist in protecting the cherry industry by eradicating or controlling the insect. As authorized by Oregon Regulations Statutes (ORS) 603-052-0150, control areas are established in the following counties: Hood River County, Lane County, Linn County, Marion County, Polk County, Umatilla County, Union County, Yamhill County, and the portion of Wasco county, north of Warm Springs Reservation.

Approved integrated pest management practices are mandatory in these areas, including spray formulations, recommended by the Oregon State Extension Service as described for specific control areas in the following extension documents:

  • For Hood River and Wasco counties: Pest Management Guide for Tree Fruits in the Mid-Columbia Area. EM 8203, Oregon State University Extension Service.
  • For Lane, Linn, Marion, Polk and Yamhill counties: Pest Management Guide for the Willamette Valley, EM 8329, Oregon State University Extension Service.
  • For Umatilla and Union counties Cherry Fruit Fly Pest Management for control areas in Umatilla and Union counties. EM 8587, Oregon State University Extension Service.

Publications: Publications referenced are available from the agency.

California Exterior Quarantine
In addition, the California Department of Agriculture (CDA) has established a state exterior quarantine against CFF for both R. indifferens and R. fausta. Oregon along with Idaho, Montana, New Mexico, Utah, Washington, and Colorado are included in California’s exterior quarantine. Quarantine states are restricted from exporting Prunus species that are hosts of CFF and capable of producing fruit; and the assoicated soil or planting media within the drip area of host plants unless certified.
CDA has listed the following Prunus hosts for R. indifferens and R. fausta: Prunus avium (sweet cherry), P. cerasus (sour cherry), P. emarginata (bitter cherry) , P. laurocerasus (cherry laurel), P. mahaleb (Mahaleb cherry), P. pensylvanica (pin cherry), P. salicina (Japanese plum), P. serotina (black cherry), P. subcordata (Pacific plum), and P. virginiana (choke cherry). Certification by authorized ODA personnel may be obtained in quarantine areas if plants are treated in a manner approved by the CDA.

Currently, three options are available to certify Prunus hosts of CFF in regulated areas:
  1. Flower/Fruit Removal: Regulated nursery stock that has not fruited, or that has had all fruit stripped prior to reaching a maturity level conducive to oviposition by cherry fruit fly in the previous and current fruiting seasons qualifies for certification if regulatory officials can verify this stipulation. Qualified nursery stock must also be safeguarded from fruiting hosts.
  2. Bareroot: Regulated nursery stock that has had fruit removed and has been barerooted (roots are washed free of soil) and repotted in sterile potting media under regulatory supervision qualifies for certification. Qualified nursery stock must also be safeguarded from fruiting hosts. Regulated nursery stock shipped bareroot and free of fruit is not regulated and does not require certification.
  3. Treated: Regulated nursery stock treated with a product approved by the Director qualifies for certification. As of 11/12/2008, no treatment has been approved by the CDFA Director.
A certification of quarantine compliance is required for CFF hosts of Prunus shipped to California. For additional certification information, contact the horticulturist in your area or the Oregon Department of Agriculture at 503-986-4640.