Identification & Prevention

Ash Tree Leaves
Identifying the Ash Tree
Identifying an ash tree can be done by looking at the leaves. The leaves are somewhat unique since they have several green leaflets per leaf stem, usually 7. The leaflets are located directly across from each other with 1 at the end.

More information on Ash tree identification (PDF).
Emerald Ash Borer on a Penny
Emerald Ash Borer
The Emerald Ash Borer is an exotic beetle from Asia which has now been found in Kane County. The Emerald Ash Borer, although small, approximately 1/2 an inch, can fly up to a mile from where it emerges.
Exit Hole of Emeral Ash Borer
Exit Holes in Tree
D-shaped exit holes can be found on trees where the adult beetles emerged. A tree with these holes has been infested for at least 1 year. They will be present on the branches and the trunk.
Suckers on Tree
"Suckers" Develop
"Suckers," or new sprouts, may develop around the bottom of the main trunk of an infested tree. They can grow until they are 2-3 inches in diameter and are again attacked by the Emerald Ash Borer.
Thinning Canopy of a Tree
Thinning Canopy
Tree canopy will begin thinning and branches will die. First there will be yellowing of the leaves, then dead branches. The thinning will begin at the top third of the tree, then spread over time. Usually, a tree will live 2-4 years after thinning at the top of the tree occurs
Notify the village for verification or for more information

If you suspect your ash trees may be infested or have a question, please email the Village Arborist.

Prevent Contamination
Firewood from ash trees is a potential carrier of the Emerald Ash Borer. Firewood from areas infested with the Emerald Ash Borer, or unknown sources should not be brought into Lisle.

Plant only reputable, locally-grown vegetation from a supplier. Do not purchase stock from a contaminated area.

Fore More Information on the Emerald Ash Borer, access the links below: