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Emerald Ash Borer

Emerald ash borer (EAB), Agrilus planipennis Fairmaire, is an exotic beetle that was discovered in southeastern Michigan near Detroit in the summer of 2002. The adult beetles nibble on ash foliage but cause little damage. The larvae (the immature stage) feed on the inner bark of ash trees, disrupting the tree's ability to transport water and nutrients. Emerald ash borer probably arrived in the United States on solid wood packing material carried in cargo ships or airplanes originating in its native Asia. As of May 2018, it is now found in 33 states, and the Canadian provinces of Ontario, Quebec, and Manitoba. Since its discovery, EAB has:

  • Killed hundreds of millions of ash trees in North America.
  • Caused regulatory agencies and the USDA to enforce quarantines and fines to prevent potentially infested ash trees, logs or hardwood firewood from moving out of areas where EAB occurs.
  • Cost municipalities, property owners, nursery operators and forest products industries hundreds of millions of dollars.

Recommended Resources

Initial county EAB detections in North America & Canada

PDF Map of EAB Locations
As of Suguest 1st, 2018
Click to enlarge

Changes/additions included since July 2nd 2018:

  • Initial county detection in:
  • Adair and Russell Counties, KY
  • Caddo Parish, LA
  • Adair, Callaway, Cape Girardeau, Greene, Jefferson, Lincoln, Polk and Warren Counties, MO
  • Halifax and Transylvania Counties, NC
  • Cass and Marion Counties, TX
  • Essex County, VA
  • St. Croix County, WI
  • Initial state detection in:
  • Washington County, Rhode Island
  • Additions to the Federal EAB quarantine
  • Minnehaha County and parts of Lincoln and Turner Counties, SD
  • Extended to all counties in Wisconsin


Important Information

Insecticide Options for Protecting Ash Trees
June 2014 - Second Edition

Tree Care Specialists - Arborists - Homeowners

This bulletin answers your questions about, and offers insecticide options for controlling EAB.

Coalition for Urban Ash Tree Conservation EAB Management Statement

This endorses ash tree conservation in urban areas as part of an integrated EAB management program. It is supported by university scientists, commercial arborists, municipal foresters, public works officials, and non-governmental organizations (NGOs).

Additional Letters of Support

What To Know About EAB

adult eab
Adult Beetles are metallic green and about 1/2-inch long.
ash
It attacks only ash trees (Fraxinus spp.)
d-shaped exit hole
Adults leave a D-shaped exit hole in the bark when they emerge in spring.
woodpecker
Woodpeckers like EAB larvae; heavy woodpecker damage on ash trees may be a sign of infestation.
ash
Firewood cannot be moved in many areas because of the EAB quarantine.
packing crate
It probably came from Asia in wood packing material.

News & Information

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EAB University

Emerald Ash Borer University

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