Removing ash trees with Emerald Ash Borer

Maybe you noticed cut trees around rights of way, park property or private property? Ash trees are being removed to control the spread of Emerald Ash Borer.

The City started preemptive removal five years ago. The plan is to eliminate more public ash trees over the next 15 years. “We always replant one for one. If the particular situation allows, we go in and plant ahead of time, but sometimes we don’t have room and have to remove trees first to create space,” Assistant Maintenance Superintendent Dave Hanson said.

Bloomington Parks Maintenance staff replant from 20 disease-resistant species of trees. Over time, the newly planted trees will replenish the canopy, and the diversity of trees will provide better protection from future insect invasions.

After City staff tree inspectors identify an infested tree, it is marked and must be removed. If it is on private property, the tree is tagged, and an information sheet is left for the property owner. Infested trees must be removed within 30 days, and the property owner is responsible for the cost.

Routine treatments can protect ash trees from Emerald Ash Borer, but they must start when a tree is healthy enough to be saved. 

“While treatments can prevent infestation, the property owner has to decide if the cost is worth it. There’s no one approach for everybody,” Hanson said.

For more information, visit or call 952-563-8760.