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Western Cherry Fruit Fly

The first capture of western cherry fruit fly occurred at the OSU-MCAREC on May 20, 2018. This is one day later than the model predicted. We continue to experience difficulties with weather stations in The Dalles and Moiser areas. Traps in unmanaged trees in The Dallesport area will be monitored. Lynn Long suggested that first emergence tends to occur when cherries reach straw color. At this point they are receptive to WCFF.

Emergence of the WCFF begins at 860 degree days in Hood River county, 990 degree days in The Dalles area, and 925 degree days in Mosier.

Western cherry fruit fly control:

  1. Apply cover spray within 7 days of emergence
  2. Apply sprays and replace baits at 7 day intervals
  3. Re-apply sprays as soon as possible after significant rain.

All models can be found at the IPPC website ( Please contact me with questions or concerns regarding the models above.

Please follow the Hood River and Wasco Co. pear and cherry extension Facebook @OSUPearAndCherryExtension or on Twitter @OSUPearCherry. I plan to provide seasonal information and articles of interest through these pages. I also encourage you to post or tweet on either page.


Ashley A. Thompson, Ph.D.

Assistant Professor of Horticulture

Fruit Tree Extension Faculty Wasco & Hood River Counties

400 E. Scenic Dr., 2.283

Phone: 541.296.5494

Washington State University