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 through an EAB treatment program to protect them. The interactive Emerald Ash Borer treatment map shows where parkway trees are being treated throughout the City.

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 a parkway ash tree, please let the City know about the treatment by filling out an 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.