Emerald Ash Borer
2013 Parkway Tree Emerald Ash Borer Treatment
The Mayor and City Council recently approved a program to
treat approximately 2,500 Ash Trees located within the
City’s parkways, for the Emerald Ash Borer. The trees will
be treated by the City Arborist beginning April 15, 2013.
Informational flyers will be distributed, prior to the
treatment, to residents that have an Ash Tree located within
their parkway. Below, please find frequently asked questions
and answers. For additional information please visit us at
www.darien.il.us or contact us at 630-353-8105.
Will the City inspect privately owned trees?
The City of Darien has recently requested courtesy quotes
for Darien residents with Ash trees. The recommended vendor
is Tree and Turf Professionals and the contact person for
Tree and Turf Professionals is Lyle McGinn.
Telephone No: 1-630-759-7389
If a resident thinks that a private property tree may be
infested with EAB, they should contact Tree and Turf
Professional. Additional information and pricing may be
found on the City’s website.
Does the insect harm any other trees? Humans?
No, EAB infests ONLY ash trees (Fraxinus spp.). It does not
affect any other type of trees or plants. The insect does
not pose any harm to humans and it is actually very unusual
to even see adult beetles.
What are the treatment options?
There are three common EAB treatment methods: trunk
injection, soil drench/injection, and bark spray. The City
is recommending the trunk injection treatment of emamectin
benzoate (TREE-age®) because it has been proven the most
effective treatment in University trials. This treatment
lasts two years. Treatments should begin in the spring, so
timing is everything. It is important to know that
treatments are NOT a one-time thing; they may have to be
repeated for the life of the tree. Additional information
about all treatment types can be found at
The parkway ash tree looks healthy, how do you know if it is
There are several signs and symptoms infested trees begin to
show after they are first infested.
1. D-shaped exit holes – 1/8” inch holes left after adults
exit the tree
2. Bark splits – vertical splits in the bark
3. S-shaped feeding galleries – can only be seen when bark
is scraped or in bark splits
4. Woodpecker damage – missing or discolored bark beginning
at the top of the tree
5. Crown Dieback – foliage at the top of the tree may thin
6. Epicormic sprouting - shoots of leaves growing from the
The problem is that it may take as many as five years after
the initial infestation for the tree to begin showing these
signs and symptoms. Heavily infested trees may appear
healthy. Once a tree begins to show outward signs of
infestation, it may only be a short time before it dies.
Why does an infested ash tree have to be removed;
can we wait until the tree is dead?
Once a parkway ash tree is found to be over 50% dead, the
City will remove it promptly. It is important for the
Department to promptly remove the infested ash trees.
Additionally, when ash trees are dead, they become brittle
and easily drop limbs, posing a major safety concern.
If you identify an infested ash tree on my parkway,
will you remove all of the ash trees on my parkway?
Only infested ash trees that do not have at least a 60%
healthy crown growth will be removed along with the stump.
Locator markings will be sprayed before stump removal in the
area to locate underground utilities. The parkway will be
restored with topsoil and seed.
Will the City contact me before removing my parkway
When a tree is identified to be removed, a colored dot is
sprayed on the tree and an informational door hanger is
placed on the resident’s front door. This is done as a
courtesy to notify residents of the status of the parkway
tree in front of their property. The door hangers have the
contact information of the Municipal Services Department.
Trees slated for removal are usually marked a few weeks
before they are actually removed in order to permit
residents time to call if they have any questions. Residents
will be notified before a tree is removed.
Will the City replace the trees that are removed
from the parkway?
It is currently the City’s policy to replace parkway trees
on a one-for-one basis as space allows. The replacement tree
is planted at no cost to the homeowner. A certified arborist
will decide if there is the appropriate amount of space (20
feet) available and an acceptable planting site is present.
With the exponential spread of EAB, the substantial loss of
trees, and current economic conditions, it is impossible to
predict changes to the funding of the planting program. It
is the City’s goal to maintain a diverse parkway tree
population by replanting where possible.
How long do I have to wait for a replacement tree?
The City’s current program and budget allows for tree
planting. Again unforeseen changes to the tree planting
program cannot be predicted. When a tree is removed, the
address is put on the bottom of the planting list and will
be replaced chronologically. Trees are usually planted in
the spring and fall seasons.
What will be the size of the replacement tree?
Replacement trees are usually 4 inches in diameter. The City
has chosen to replant this size of tree based on
transplanting, survivability, cost, and labor.
Can I choose what type of tree will be replanted?
Residents will have the ability to select from an approved
list of parkway trees. Available species are chosen based on
stock availability, viability of species, appropriateness of
parkway installation, diversity, and proven success.
Why can’t I choose the same tree as all of my
Diversity is the key to creating an urban forest. As we
learned with Dutch Elm Disease and are now learning with
Emerald Ash Borer, planting a single species in mass numbers
is a poor urban forestry practice that can have devastating
Can I plant my own parkway tree?
No. The City’s planting program is in place to provide
replacement trees to homeowners. Our City Arborist makes the
educated final decision as to the type and quantity of trees
that will be planted in the parkway. It is important that
the appropriate tree is selected for each and every site in
the City’s parkways. City staff will work with homeowners as
much as possible.
For more information or questions, please call the Municipal
Services Department at 630-353-8105.
Emerald Ash Borer Private Property Treatment
The City of Darien has recently received competitive quotes
for the treatment of the Emerald Ash Borer located on
private property. The recommended vendor is Tree and Turf
Professionals. The treatment method consists of a licensed
applicator injecting the tree with the product Treeage. For
additional information regarding the treatment and general
information please visit the following website:
The tree would be drilled with a small hole(s) and larger
trees will require multiple holes based on the diameter of
the tree. The Treeage product is injected based on the tree
diameter and sealed with a plug(s). The application is good
for up to two years. The Ash tree must have a minimal 60%
healthy canopy to be a candidate for the treatment. The Tree
and Turf Professionals shall review each Ash tree prior to
treatment. All payments shall be the responsibility of the
homeowner. The contact person for Tree and Turf
Professionals is Lyle McGinn at 630-759-7389 or email at
The measurement for a tree is determined by the diameter. If
you would like to determine the measurement of your tree
take an inch tape measure and measure approximately 4-foot
up from the base of the tree and around the tree. This will
be your circumference. You can then go to the following
Insert the unit number in the Circumference box and move the
pointer to the Solve Others box and hit Enter. The
calculator will provide the Diameter. Below is the pricing
schedule for the treatment.
|Ash Tree 3 to 6 inch Diameter
||$55.00 Per Application
|Ash Tree 6 1/8 to 10 inch Diameter
||$88.00 Per Application
|Ash Tree 10 1/8 to 14 inch Diameter
||$116.00 Per Application
|Ash Tree 14 1/8 to 18 inch
||$144.00 Per Application
|Ash Tree 18 1/8 to 22 inch Diameter
||$172.00 Per Application
|Ash Tree 22 1/8 to 26 inch Diameter
||$215.00 Per Application
|Ash Tree 26 1/8 to 30 inch Diameter
||$255.00 Per Application
|Ash Tree 30 1/8 to 35 inch Diameter
||$399.00 Per Application
|Ash Tree 35 1/8 to 40 inch Diameter
||$454.00 Per Application
|Ash Tree 40 1/8 to 45 inch Diameter
||$509.00 Per Application
|Ash Tree 45 1/8 to 50 inch Diameter
||$564.00 Per Application
|Ash Tree 50 1/8 to 55 inch Diameter
||$619.00 Per Application
|Ash Tree 55 1/8 to 60 inch Diameter
||$674.00 Per Application