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Emerald Ash Borer

On July 5, 2011, the Village of Carpentersville (Village) received notice from the Illinois Department of Agriculture confirming the presence of the Emerald Ash Borer (EAB) within our community. The EAB was verified in our community through outreach activities performed by the Illinois Department of Agriculture's EAB staff. A copy of the Memo from the Illinois Department of Agriculture confirming the Village's EAB infestation is available for review and download. Unfortunately, the arrival of EAB will have a serious impact to the Village's tree canopy, aesthetic environment, and budget for numerous years to come.
The Village's EAB Policy is available for review and download.

Information on the control of the EAB can be found on-line at, a website maintained by the Illinois Department of Agriculture as well as

Frequently Asked Questions

What is Emerald Ash Borer (EAB)?

EAB is a non-native species to North America. It was discovered in southeastern Michigan in the summer of 2002. EAB probably arrived in the United States on solid wood packing material conveyed in cargo ships or airplanes originating from its native land, Asia. The adult beetles nibble on ash foliage but cause little damage. The larvae (the immature stage) feed on the inner bark or cambium layer which is the crucial layer between the bark and wood of ash trees, thus, disrupting the tree's ability to transport water and nutrients. According to the Illinois Department of Agriculture, the Emerald Ash Borer typically moves only short distances by flying, but can survive long distances in transit on ash nursery stock, ash logs, branches and firewood. The beetle killed tens of millions of ash trees in southeastern Michigan alone, with tens of millions more lost in Ohio, Illinois, Indiana, Pennsylvania, West Virginia, Missouri, Wisconsin, Virginia, Ontario and Quebec. Adult beetles are bright, metallic-green in color. Adults are typically one-third of an inch long and one-sixteenth of an inch wide. They have rounded abdomens and flat backs. Larvae are creamy white and have flattened, segmented bodies. Older larvae grow up to an inch long. They feed under ash tree bark from mid-summer through spring, damaging the ash tree's vascular tissue. These beetles only infest ash trees.

EAB Adult

EAB Adult on treeEAB Adult on a penny for size comparison

EAB Larvae

3 EAB Larvae ranging in size


How do I identify if I have an Ash tree?

Branches will grow opposite of one another:
Tree Branch Pattern growing opposite of each other

 The tree bark will have diamond pattern:
 Ash Tree Bark with diamon pattern

A compound leaf will be composed of seven or nine leaflets:
Ash leaf with 9 Leaflets
Ash, One Leaf, 9 Leaflets
Green Ash leaf with 7 leaflets
Green Ash, One Leaf, 7 Leaflets
Black Ash leaf with 7 leaflets
Black Ash, One Leaf, 7 Leaflets
White Ash leaf with 7 leaflets
White Ash, One Leaf, 7 Leaflets

How do I know if I have a tree that is infested with EAB?

You can help the Village manage the EAB by monitoring ash trees on your property. Trees infested with EAB can have the following tell-tale signs:

Canopy dieback
Smaller Ash Tree with Canopy diebackLarger Ash Tree with Canopy Dieback

D-shaped exit holes on the tree bark
D-Shape Hole next to finger nail for size comparisonD-Shaped hole with measurement

Excessive sprouting or growth at the base of the tree
Excessive Sprouting close-upExcessive Sprouting showing entire tree

Splits or fissures on the trunk of the tree
Fissure on trunk of treeSplit on trunk of tree

S-Shaped galleries beneath the bark
S-Shaped Galleries close up on light colored treeS-Shaped Galleries close up on dark tree

Increased use by woodpeckers / woodpecker damage
Woodpecker damage on large tree trunkWoodpecker damage on smaller tree trunk

What steps has the Village taken to eradicate trees infested with EAB?

During the summer and fall of 2012, the Public Works staff surveyed and inventoried the Village's entire ash tree population and found a total of 2,473 ash trees. As part of the ash tree inventory, staff rated every tree in accordance with the Emerald Ash Borer Policy. The rating system utilized by the Village is detailed below.

Level 1 - Tree is showing some signs of EAB infestation but cannot be determined with reasonable certainty. Tree will be monitored on a quarterly to bi-annual basis.

Level 3 - Tree is showing obvious signs of EAB infestation and will be monitored very closely. Tree will almost certainly die off completely within 1-2 years.

Level 5 - Tree is almost or completely dead due to EAB infestation. Tree shows more than two obvious signs of EAB infestation and needs to be removed and/or replaced.

To date (2017), the Village has removed approximately 2,281 ash trees from the public right-of-ways and Village owned properties that were given a "Level 5" rating.

Will the Village replace my parkway tree?

Public Works crews have removed over 2,281 ash trees that have become infested or were previously dead since 2012, and will most likely be removing trees for the next five years.  Funds have been allocated on an annual basis for trees that have been removed.  To date (Spring, 2017) the village has replaced over 2,094 trees with a more than a dozen of tree species.  

Will the Village remove the tree stump once the tree is removed?

Yes. Stumps are added to a list and ground (removed), within 60-90 days of the removal of the tree. Due to the potential high volume of work, this timeframe may be adjusted. Depending on the season, wood chips may remain in place or the area will be restored with topsoil and seed & blanket.

Why do the plants, edging, and landscape blocks need to be removed prior to stump removal?

Machines used for grinding stumps are essentially large-scale chainsaws with teeth that are designed for use on wood and topsoil only. Blocks, edging, and landscaping may prohibit the unit from accessing the stump and can cause damage to the machine.

May I replace a tree in the parkway at my own expense?

Yes, funds from the Village's Tree Replacement Cost Sharing Program can be utilized until the funding source is exhausted; however, property owners may plant approved trees in the parkway at an owner's expense as well. The program is offered on a first-come, first serve basis. Per the approved EAB Policy, property owners will be reimbursed at a rate of $100 per tree. Should property owners take advantage of this voluntary tree replacement cost sharing program, the property owner will need to take the following steps:

Step #1 - Contact the Village's Public Works Department (PWD) at 847-836-2464 for a brief overview of the cost sharing program and to review the following steps.

Step #2 - Stake-out the exact location where you would like the tree(s) to be planted with a flag or wooden stake and contact Julie at 1-800-892-0123. This step will ensure that all of the underground utilities within the parkway are located and will not interfere in the planting of the tree(s). If requested by the property owner, the Village will provide the property owner with assistance in staking out the tree(s). However, the property owner must be present during this visit. Once this step is completed, please contact the PWD. Staff members will verify that the tree(s) is located in an acceptable location - compliant with all Village policies. In an effort to maintain proper spacing, all efforts should be taken to plant trees within the area where the original tree(s) was removed from.

Step #3 - Choose a tree from the from the Village's Permitted Tree Species List (Ordinance 16.80.080). Note: Any tree(s) planted within the right-of-way is required to be at least 2.5-inches in diameter measured at six-inches above grade level. See EAB Policy for further information regarding cost sharing requirements.

Step #4 - Once you have chosen an approved tree, complete the Village's Right-of-Way Tree Planting Application permit and submit the to the Village.  There is no charge for this permit. The Village will also be reviewing the tree species selected and making sure that a diverse tree canopy is accomplished for your particular street. Once the Village has received the completed application, staff will prepare the License Agreement For Use of Village Parkway which will need to be executed by the property owner prior to conducting any work within the Village's right-of-way.

Step #5 - Plant your tree per the nursery's recommended guidelines. Keep all receipts and invoices associated with the purchase of the tree as well as its planting costs. The Village will need copies of this information to process your $100 reimbursement.

Step #6 - Once your tree has been planted in the proper location, members of the PWD will verify that you have fulfilled the permit requirements and begin the refund process for your newly planted tree.


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