Emerald Ash Borer
In order to help residents deal with this invasive pest,
the Township passed an "Emerald Ash Borer Resolution" in 2003.
To review the resolution,
Emerald Ash Borer
- Invasive species in US; native to Asia
- Adult wood boring beetle, is a dark metallic
green color, ˝ inch long
- Larvae are flat, cream-colored grubs with wide
- Attacks only ash trees (white, black and green)
- Adults leave a D-shaped exit hole in the bark
when they emerge in spring
- Firewood movement is restricted because of the
EAB quarantine. Remember to BUY IT! BURN IT! LEAVE
According to the Michigan Department
of Agriculture (MDA), the adult beetles are present from
mid-May until late July. Larvae, which are a creamy white
color, can be found under bark. The larvae feed on the inner
bark of white, black & green ash trees, disrupting the tree’s
ability to transport water and nutrients. Please download this
for more information on the life cycle of the EAB.
The distinctive leaves and bark of the ash tree (Fraxinus
spp.) can help to identify it from other tree species. Ash
trees have five, seven, or nine leaflets per leaf stem. The
leaves are located directly across (or opposite) from each
other. The bark is light gray and is rough and scaly on older
trees. For more information on ash tree identification, please
click here for a
helpful identification fact sheet.
Evidence of Infestation
Symptoms of the EAB infestation can include: the initial
thinning or yellowing of the foliage (general or limited to
certain branches); epicormic shoots which may or may not be
present on declining trees; woodpecker damage from the birds
stripping away small patches of bark, so that they can extract
the borers; and D-shaped emergence holes (about 3 mm in
diameter) which are probably present in multiple year
infestations. You may also observe that the beetles feed on
ash foliage usually in small irregularly shaped patches along
the margins of leaves. The tissue produced by the tree in
response to larvae feeding may cause vertical splits to occur
in the bark. Injury to the tree from woodpecker activity may
also occur particularly in the winter. These photos below
illustrate the just a few examples of EAB infestation signs
and symptoms; please click here for an
additional informational fact sheet.
Tree canopy thinning and die back;
yellowing of leaves
D-shaped emergence holes
Suckers developing on the main trunk
Spread of EAB
The EAB presence had gone undetected until 2002 when
excessive ash tree deterioration and death were first
documented in Michigan. Although it is believed that the EAB
entered the U.S. in wood packaging materials from Asia, it’s
speculated that the beetles may have been active in the
Detroit area for five years or more prior to 2002.
To date, the exotic pest has killed tens of millions of ash
trees in southeastern Michigan alone, with tens of millions
more lost in Illinois, Indiana, Kentucky, Minnesota, Missouri,
New York, Ohio, Ontario, Pennsylvania, Quebec, Virginia, West
Virginia, and Wisconsin.
Quarantine and Ban on Movement of
Firewood in Michigan
Although the EAB can fly up to a half mile from where it
emerges, the movement of hardwood firewood has proven to be
the source of many "outlier" infestations throughout Michigan.
Not only does the introduction of EAB infested materials
severely impact the beauty of affected landscapes, more
stringent fines and penalties make hardwood firewood movement
a costly mistake. Help protect Michigan’s natural resources by
following these firewood recommendations, BUY IT, BURN IT,
LEAVE IT! Buy firewood when you reach your destination,
burn firewood on site, and leave unused firewood behind.
Michigan’s quarantine area includes all counties located in
the Lower Peninsula and several areas of the Upper Peninsula.
Under the quarantine it is illegal to move ash trees,
branches, and wood chips larger than one inch in diameter, and
non-coniferous firewood outside the Quarantine Area. EAB
quarantine areas and levels are indicated on the
EAB quarantine map. In response to the discovery of
additional infestation sites, hardwood firewood movement
within Michigan’s Lower Peninsula has been restricted and
movement out of the quarantine areas and out of the Lower
Peninsula is prohibited. Violations of the EAB
quarantine can result in fines or penalties ranging from
$1,000 to $250,000 and up to five years imprisonment.
Frequently Asked Questions
Whose tree is it?
Residents are responsible for the maintenance of trees on
their private property. The Road Commission for Oakland County
(RCOC) is responsible for the maintenance of trees along the
street. However, the RCOC’s responsibility is limited to
taking down dead hazard trees or limbs in the road
right-of-way. If you believe that you have a dead, damaged or
hazard tree along the right-of-way, please contact RCOC
Citizen Service at 248.858.4804 or fill out
a contact form.
If a dead tree or any part of a tree is within ten feet of
a pole-to-pole power line, you can contact DTE Energy at
800.477.4747 to request a ‘Line Clearance Review’ to determine
if anything needs to be done by the utility prior to any
What can I do to protect my ash trees?
advise you to have commercial applicators treat your ash
trees, particularly your large trees. However, homeowners can
treat small trees very effectively. Be sure to read the label,
follow the directions and wear the necessary personal
protective gear. Michigan State University Extension of
Oakland County has prepared a monthly guide that outlines
actions that may be taken throughout the year involving
assessment and treatment. Another valuable tool,
Homeowners Guide to EAB Treatment, describes varies
products and lists treatment recommendations.
Are there any guidelines I should
follow when hiring an arborist or tree care company?
Before you make the decision to hire an arborist,
this quiz. If you plan to remove your tree, be sure to
hire a reliable, insured, and licensed arborist/tree care
company. Before work commences, be sure to obtain:
- Estimates from multiple companies.
- Proof of insurance
- Written estimates of cost
- Written agreement of disposal/site cleanup requirements
The International Society of Arborists state of Michigan
maintains a list of certified arborists.
Click here to find a certified Arborist or board certified
Master Arborist. You will need to enter your specific zip
can I landscape to avoid further infestation in the future?
Ash trees should be avoided as landscape options in areas
where the Emerald Ash Borer problem is known. Alternative
options are numerous, but diversity is the key to managing
further losses due to the EAB or other diseases that may occur
in single species tree plantings. Therefore there
is a need to select the right tree for the right place.
Selection should be based on adaptability, available space,
design intent, ornamental characteristics and diversity. See
Recommended Alternatives to Ash Trees for Michigan’s Lower
Peninsula publication by MSU Extension for a place to
Please contact the
Township Engineering and Environmental Services Department
if you have questions about the
material presented here. Please visit the following websites
for more information on the Emerald Ash Borer.
Emerald Ash Borer Information
Michigan Department of Agriculture
North Central Research Station of the USDA
Photos courtesy of: www.michigan.gov/mda
Updated: January 2009
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4200 Telegraph Road
P.O. Box 489
Bloomfield Township, MI 48303-0489
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Bloomfield Township, Michigan
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