Emerald Ash Borer

The emerald ash borer (EAB) insect is an exotic woodborer that was found to be attacking and killing ash trees in Michigan in 2002. The Emerald Ash Borer attacks only ash trees and is a devastating and destructive pest that greatly affects the urban forest. EAB is easily spread through the movement of firewood, logs and nursery stock.
Adult Emerald Ash Borer
Since its detection, EAB has killed millions of ash trees and has spread into Indiana, Ohio, Illinois, Wisconsin, Iowa and other states. Discovered in Illinois in 2006, EAB has since spread throughout northeast Illinois into the nearby towns of Geneva, Batavia, North Aurora and Naperville as well as other locations statewide.

The first confirmation of EAB in Aurora was found in a “trap” tree located on the city right-of-way on Liberty Street just west of Route 59 in Du Page County in 2008. Since this initial confirmation, the EAB has spread throughout the City.

Homeowners Preparation

Homeowners should periodically examine their trees for any signs of an EAB infestation (i.e. sprouting near base of tree, woodpecker holes are present, bark splitting and D shaped holes).

City’s Response to EAB Since Discovery in Aurora

Aurora has adopted a two-part ash tree removal strategy on city-owned property as a management plan to help mitigate and control the spread of EAB. Ash tree removal has been the preferred strategy used by the majority of communities with confirmed EAB infestation.
  • Part I: Newer Subdivisions
    Aurora crews are currently working from subdivision to subdivision, clear cutting all ash trees. A notice is placed on the ash trees one week prior to removal to inform the homeowner of the scheduled work to be performed.
  • Part II: All Other Areas of the City
    Ash trees that exhibit signs of EAB infestation will be removed along with any other nearby ash trees on the same block. At this time, the City will not be removing healthy ash trees unless requested by the homeowner.
If in the opinion of the City’s arborist the tree is not considered a hazard, homeowners whose trees are being chemically treated can request the tree not be removed.

Please contact the Street Division if you have any questions or concerns at 630-256-3680.

Insecticide Options for Treating Ash Trees

Chemical treatment options do exist but have not been proven to be 100% effective. Consult a professional arborist for information. The insecticide options bulletin (PDF) is designed to answer frequently asked questions and provide the most current information on insecticide options for controlling emerald ash borers.