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Emerald Ash Borer

In August 2017, the first case of Emerald Ash Borer (EAB) was confirmed in the City of Brooklyn Park. The small, invasive insect infects ash trees and spreads quickly, typically killing a majority of ash trees in its path. Many Minnesota communities have seen the effect of the ash borer as it spreads.

EAB is native to eastern Asia but was discovered in Detroit, Michigan, and Windsor, Ontario, in 2002. Indications are it may have been introduced to this area as early 1990. EAB has been spread in ash firewood, nursery stock and possibly other ash materials to a number of new areas. View a map of EAB finds and quarantines in Minnesota.

Identifying Emerald Ash Borer

The first step is to inventory trees and determine whether or not ash trees are on the property.  While difficult to recognize in early stages, there are telltale signs that EAB has infected a tree. It’s easiest to spot signs of EAB in the fall, winter and spring, when leaf coverage is minimal. Look for bark splitting, canopy thinning and small D-shaped exit holes. Also note increased woodpecker activity around trees – woodpeckers feed on EAB and often locate a colony before the experts can.

To be certain of EAB status in a tree, call a private tree contractor.

EAB Has Been Identified in the Area: What’s Next? 

Develop a Plan

Because EAB spreads so rapidly, it’s important to develop a plan of action as soon as the invasive species has been confirmed in the area. There are basically two options for property owners with ash trees – begin a course of treatment immediately, or plan for the tree to be removed.


A two-year insecticide treatment typically costs roughly $100-250, depending on the size of the tree. This treatment will likely be necessary for the rest of the tree’s life. Contact a private tree contractor for treatment options. Less expensive do-it-yourself treatments are also available, though they are considerably less effective. If you choose to treat your tree, please contact the City's forester so we have a record of treated trees in the city.


It is recommended that tree removal should occur during the inactive season for EAB (October to May). This will reduce the threat of a colony relocating.

Transporting Removed Trees 

Wood from removed trees should not be transported outside the Minnesota Department of Agriculture’s quarantine area, which includes Hennepin, Ramsey and other metro counties. Observing the quarantine is crucial to stemming the spread of EAB.

City of Brooklyn Park’s Role

It is the property owner’s responsibility to remove infested and hazardous trees on his/her property. The City is responsible for trees on all public property, including boulevard trees.

Additional EAB information and resources can also be found at:



If you have any questions, please contact City Forester Mark Anderson between the hours of 6:00 a.m.to 2:30 p.m.

Mark Anderson
City Forester, City of Brooklyn Park
Email Mark Anderson



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