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Emerald Ash Borer Program

emerald_ash_borer_1.jpgEmerald ash borer (Agrilus planipennis Fairmaire) (EAB) has become the most destructive invasive forest insect in North America.  First identified as the cause of ash decline and mortality in Detroit, Michigan and Windsor, Ontario in 2002, this phloem-feeding buprestid has killed tens of millions of ash trees (Fraxinus spp.) in forest, rural and urban settings. 

Adult beetles nibble on ash leaves during the summer, but cause little damage.  EAB larvae, however, feed in S-shaped galleries in phloem which often score the outer sapwood.  Larval galleries disrupt nutrient and water transport, effectively girdling branches and entire trees.  Established EAB populations build and spread over time, but human transport of infested ash nursery trees, firewood or logs can lead to new infestations well beyond the existing core populations.  These discrete “outlier” sites are often not discovered until 4-6 years after establishment. 

After a new EAB outlier site is discovered, quarantines are imposed to limit the chance of infested ash material being moved further.  Residents, property owners and municipalities in the affected area, however, are left to fend for themselves.  If no action is taken, EAB populations in the outlier site will undoubtedly build and spread.  Ash mortality will progress and an ever-greater area will be faced with the economic and ecological impacts of EAB.  The current approach in EAB outlier sites could mean the demise of the North American ash resource, including at least 15 native ash species.


















Girdled Ash Tree                                          Purple Trap in Tree






























Insecticide Training in Moran - July 2010


Click here to access the official Emerald Ash Borer web site.

Click here to access the "Slow Ash Mortality" web site.

Cooperation Emerald Ash Borer Project map - Click here


Information and Fact Sheets

Insecticide Options for Protecting Ash Trees from Emerald Ash Borer; Daniel A. Herms, Deborah G. McCullough, David R. Smitley, Clifford S. Sadof, R. Chris Williamson, and Philip L. Nixon; June 2009



Motor Vehicle Use Map, Hiawatha National Forest, Sault Ste. Marie/St. Ignace Ranger Districts, Michigan 2010/2011; United State Department of Agriculture, Forest Service

Location of Forest Health Plots - 2010 - Mackinac County

Ash Distribution - 2010 - Mackinac County

Ash Density (trees per acre) - 2010 - Mackinac County


This page last updated on 10/19/2018.

2847 Ashmun St. | Sault Ste. Marie, MI 49783 | (906) 635-1278

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