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Emerald Ash Borer

Help us protect and treat our community’s trees from invasive species!

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.

Brooklyn Park encourages residents to consider treating large, well-placed, healthy ash trees on private property as part of an EAB treatment program. Treating an ash tree is more cost-effective than removal and replacement. It also maintains the tree benefits and value of a mature tree to your property.

Brooklyn Park’s EAB treatment program

Brooklyn Park has contracted with Rainbow Treecare to treat public ash trees growing along streets and in the parks.

This agreement includes a discount for homeowners in Brooklyn Park to have their ash trees treated as a discount. The discount is available through 2020. View the flier (PDF) >

For more information about the discount program or to schedule a free consultation, contact Rainbow Treecare.

Visit the Rainbow Treecare website
Email Rainbow Treecare

Identifying Emerald Ash Borer

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.

Read steps to identify if your tree has Emerald Ash Borer

Emerald Ash Borer 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 to $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.

Learn about preserving the trees


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.

More information

Additional EAB information and resources can also be found at:

Hennepin County

Minnesota Department of Agriculture

Minnesota Department of Natural Resources

University of Minnesota

Purdue University