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COVID-19 Advisory: WSU Extension is working to keep our communities safe. All Extension programming is being conducted consistent with the latest official state guidance. WSU Extension county offices and WSU Research & Extension Centers are following protocols for vaccination, masking, distancing and hygiene. If this office is not open to the public, we are available during normal business hours via email, phone, and web conference.

Apple Maggot Host Reduction Project

Cooperative Project Between Multiple Agencies:
Washington State Department of Agriculture, North Yakima Conservation District, USDA-ARS, Washington State University, Yakima County and Chelan County.

Beneficial to Commercial Growers

Reduction in trade barriers and removal of host that cause troubles to growers.

Why We Are Doing It?

  • Currently $500,000 annually to manage Apple Maggot with each year the cost of controlling “invasive Pests” continues to rise.
  • $220,000 Grant over two years to prove the feasibility of host removal and replacement
  • Reducing Alternative Hosts is a better method of pest management
  • Cost of this strategy is high initially.  After 5 years is less costly than sprays.
  • Habitat Manipulation is an effective and more ecologically sound method of pest management.


  • Reduced Pest Population
  • Reduced Spray Applications
  • Reduced Apple Maggot Detections
  • Increased Profitabiltiy
  • Attain/Maintain “Pest Free Status”

Outcomes Achieved:

Pest Management Fact Sheets

We are working with landowners and removing Hawthorn and neglected fruit trees.

  • Host of the Pest is Removed
  • Replacement plants are planted of equal or greater ecological value

Ferral Apple Tree    Hawthorn Tree Being Removed
Hawthorn Tree Being Removed


Hawthorn Next to Orchard  Large Hawthorn