Emerald Ash Borer

The EAB is an invasive insect native to Asia that was introduced into the United States via wooden packing material.  It was first discovered near Detroit, Michigan in 2002.  The insect has spread through the Midwest since its’ arrival and was discovered in Wisconsin in 2008. In the fall of 2015, it was found in Monroe. In Asia, the insect has had little impact due to the existence of natural predators.  However, there are no natural predators in the United States to keep the insect in check and therefore, it has had a devastating effect on the ash tree population.

The moving of firewood has caused most EAB infestations.  Green County is among one of the many quarantined counties in Wisconsin.  
Quarantines prohibit the movement of ash trees, branches, firewood and any other ash wood products out of a quarantined county to a non-quarantined county unless the material is chipped to one inch or smaller.

Is the City cutting down my terrace ash tree?
Property owners will also be contacted if the city will be removing their terrace ash tree.  The terrace ash tree inventory and condition ratings can be seen on the city’s website at under the Department Park Recreation Forestry tab.  

What is the City doing about EAB? 
The City of Monroe has been fortunate to receive Department of Natural Resources Urban Forestry grants in 2015, 2016 and 2017 to help fund the City’s efforts to deal with EAB.  In 2015, the grant funded a public tree inventory which identified 680 terrace ash trees and 97 ash trees in city parks.  The inventory gave condition ratings to the trees.  These are used to determine if the ash trees will be pre-emptively removed or could be considered for treatment.
In 2015, 29 ash that were in poor condition or interfering with other infrastructures such as blocking stop signs or growing under overhead lines were removed.  In 2015, 37 park ash trees in good or excellent condition with a trunk diameter of 8” and above were treated with a trunk injection to protect them from EAB for 2 years.  Park ash trees treated were near playgrounds and shelters.
In 2016, 52 ash trees were removed and 228 terrace ash trees in good or excellent condition with a trunk diameter of 8” and above were treated.
In 2017, we are planning on using the Urban Forestry grant to treat 100 more terrace ash trees along with the 37 park ash trees treated in 2015.  An estimated 70 ash trees are to be removed in 2017.

In 2018, 65 ash trees were removed.  125 ash trees were treated.  
In 2019, we are planning on using the Urban Forestry grant to treat about 100 trees that were treated in 2017.  An estimated 60 ash trees were removed in 2019.

What can I do about ash trees on my private property?

  •  Monitor your trees’ health and watch for signs and symptoms such as dieback in the upper and outer tree top and “D” shaped exit holes in the bark where adult beetles have emerged.
  •  Understand chemical treatment options.  Local garden centers have soil drench products that can be applied by property owners along with local tree care companies that do trunk injections.
  •  Private contractors can be hired for the removal of your tree. It is important to make sure you are working with a qualified contractor and they have the appropriate insurance and workers compensation coverage.
The website has additional information on EAB. 

Emerald Ash Borer Management Plan
Emerald Ash Borer Information Brochure