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Northern Research Station
One Gifford Pinchot Drive
Madison, WI 53726
(608) 231-9318
(608) 231-9544 TTY/TDD

Forest Disturbance Processes

Emerald Ash Borer

[photo:] Adult emerald ash borers emerging from exit holes.The emerald ash borer (EAB), Agrilus planipennis (Coleoptera: Buprestidae), was discovered as the cause of extensive ash tree (Fraxinus spp.) decline and mortality throughout southeastern Michigan in June 2002. Evidence suggests that A. planipennis first entered Michigan from China in the 1990s, presumably from solid wood packing materials used to transport manufactured goods. EAB has subsequently been found in at least 24 US states and 2 Canadian provinces as of March 2016. (View distribution map.) Spread of EAB results from EAB flight and human transport of infested ash firewood, logs, lumber, and nursery stock.

To limit human-assisted spread of this pest from areas infested with EAB, states imposed quarantines and regulations on the transport of ash trees and ash wood products. Federal quarantines were imposed by USDA Animal and Plant Health Inspection Service and the Canadian Food Inspection Agency.

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Last Modified: 04/01/2016