Feb 19, 2021
Potential apple maggot quarantine for Okanogan County meeting topic

In 2020, Washington State Department of Agriculture placed a total of 281 adult fly traps on host trees in the pest-free area of Okanogan County.

We documented 69 positive sites that captured 471 adult apple maggots.  WSDA sampled hawthorn berries for AM larvae at three positive sites. These sites yielded over 385 AM pupa in red hawthorn in Okanagan Co.  In accordance with WSDA policies, the finding of two or more life stages of apple maggot indicates a breeding population and initiates a need for expanding the quarantine in Okanogan County.

Representatives of WSDA and of the Apple Maggot Working Group are seeking discussions about the pending quarantine with the Okanogan County growers/shippers who are likely to be impacted by this action.

An online Zoom meeting to be held March 3 from 1:30 p.m.-3 p.m. will cover:

  • Update on apple maggot finds in Okanogan County;
  • Explanation of what triggers a quarantine;
  • Explanation of what a quarantine means for growers and packers in Okanogan County;
  • Request for feedback;
  • Q&A.

Due to COVID-19 restrictions this meeting will be available via conference call/web interface.

To join via computer: https://wsu.zoom.us/j/8297476290  Meeting ID: 829 747 6290
To join via phone: 1 253 215 8782 Meeting ID: 829 747 6290.

Michael R. Bush
WA State Dept Agriculture- Plant Protection Division
(509) 249-6966
[email protected]

Will Carpenter
Chelan/Douglas Pest Board
(509) 393-0975
[email protected]

Tianna DuPont
Washington State University Extension
(509) 713-5346
[email protected]




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