Apple Maggot Quarantine Area

The quarantine was declared in the early 1980s to arrest the spread of the apple maggot into a portion of Eastern Washington.

[1] The quarantine was declared thereafter and is designed to protect Washington's core apple growing regions from infestation.

[18] In addition to these areas, as of 2017, all or portions of the state's counties of Chelan, Clallam, Clark, Cowlitz, Grays Harbor, Island, Jefferson, King, Kitsap, Klickitat, Lewis, Lincoln, Mason, Pacific, Pierce, Snohomish, Spokane, Skagit, Skamania, Thurston, Wahkiakum, Whatcom, and Yakima, are also quarantined.

[18] Washington State University's Tree Fruit Research and Extension Center has cited the fact that "apple maggots have never been found in commercially packed fruit in the state" as evidence of the quarantine's efficacy.

[21] In addition, under state law pest control officials can order property owners to spray with pesticides trees in which the apple maggot has been observed.

A quarantine sign on State Route 522 near Woodinville, Washington
The Apple Maggot Quarantine Area was established to control the spread of the apple maggot ( pictured ) into a protected agricultural area of eastern Washington .
A map showing the approximate boundaries of the Apple Maggot Quarantine Area within the United States as of 2017. Areas in red are under quarantine by Washington state, areas in grey are those outside the state free from quarantine, and areas in green are those within Washington free from quarantine.