Emerald Ash Borer - Text Only

Ash Trees & EAB

The Emerald Ash Borer (EAB) is an invasive pest that attacks and kills native ash trees. Ash trees are native to Illinois and commonplace in Naperville.

The City is treating parkway ash trees to protect them against the EAB. Learn more about the EAB program here.

The interactive Emerald Ash Borer treatment map shows where parkway trees are being treated throughout the City. You can view the map here.

Treating Your Ash Trees

Homeowners with ash trees have two options: treatment or removal. Treatment has been proven to save ash trees, and Naperville's own parkway ash treatment program has been very successful.

If you've treated one of your ash trees, please let the City know about its treatment. You can either submit a fillable PDF (link on the right side of the page) or download and mail the form: EAB Treatment Form

Please Water Your Trees


Proper watering is critical in the 4-6 weeks after treatment. Watering aids in treatment take-up and lowers tree stress levels.


Key: A long and slow soaking, not a short and fast hosing. Moisten the soil to several inches deep, but don't overwater. Water under the dripline, but focus near the trunk.


April to September, weekly, when less than one inch of rain has fallen.