Emerald Ash Borer

Emerald Ash Borer (EAB) is an invasive insect from Asia that attacks and kills ash trees. The larvae of EAB tunnel under the tree's bark, which interrupts the flow of water and food throughout the tree.

While EAB has not been confirmed in Fridley, it can take a few years for EAB symptoms to manifest. Since EAB has been found nearby, it is likely already present in Fridley. Once symptoms are present, the ash tree typically dies within one to three years if not properly treated. 

Symptoms of EAB include:
  • Thinning foliage
  • Increased woodpecker activity
  • Vertical bar cracks

EAB

City of Fridley Emerald Ash Borer Mitigation Plan

Many ash trees were planted in Fridley following the 1965 tornado and the loss of elm trees to dutch elm disease. Based on a survey of the City's street and park trees, over 30% of Fridley's urban tree canopy is comprised of ash. Losing these ash trees all at once would be devastating to the City's urban forest and removing such a large quantity of trees simultaneously would be prohibitively expensive. 

The City is currently managing ash trees on public lands and right-of-ways under the City of Fridley EAB Mitigation Plan. This plan was developed to prevent the spread of EAB, save high value ash trees, diversify the City's urban forest, and reduce the costs of tree removal. The full plan can be viewed here.

Ash Trees in Your Yard

If you have an ash tree in your yard, start preparing for EAB now. Once an ash tree starts to die, it can quickly become a safety concern. You can decide to remove the tree and replace it with a different species or plan to chemically treat the ash to prevent infection. Ash trees must be treated every 1-3 years. This calculator can help you estimate the cost of treating your ash trees.

Some chemicals used to treat EAB can be harmful to beneficial insects such as pollinators if applied improperly. If you are interested in treating your ash tree, call a Fridley-licensed tree company and request that the treatment be applied as a systemic injection. Systemic injections are the most effective form of treatment and are the least likely to adversely impact pollinators. Avoid using treatments that are applied as soil drenches, which can leach into water or drift to pollinator habitat.

​Report a Concern


If you think that your tree is already infected, contact the Minnesota Department of Agriculture at Arrest.the.Pest@state.mn.us or 888-545-6684.

Have you seen an ash tree in a City park or right-of-way that might be infected? Report a Tree Concern