Wednesday, July 25, 2012

Protecting Ash Trees From Emerald Ash Borer

Emerald ash borer is a metallic green, wood-boring beetle native to parts of Asia. In North America, it is an invasive pest that can kill all the different kinds of our native ash trees.  The emerald ash borer is not a threat to human health but it kills our native ash trees of any size, any age, healthy or unhealthy. The Village of Bellevue has over 1,000 public ash trees along streets and within park areas.

A significant Emerald Ash Borer (EAB) infestation was identified in downtown Green Bay at the WPS corporate headquarters this past June.  Approximately 36 ash trees were reported to have been heavily infested.

The larva (the immature stage of EAB) spends its life inside ash trees, feeding on the spongy layer of tissue just beneath the bark. This feeding destroys that tissue and stops the trees' ability to move water and nutrients back and forth from the roots to the rest of the tree. The tree starves and eventually dies.

EAB can kill an ash tree in just a few years or a little longer depending on the size of the tree. It is estimated that more than 50 million ash trees are dead or dying in the Midwest because of this insect.

What Can Homeowners Do?

Homeowners can take preventative action in helping preserve our community's ash tree population.  The follow video provides instructions on how to apply a soil drench application of pesticide.  This application has proven to reduce the impact of EAB.

Village Action

At this time the Village will not be treating street, and park ash trees.  However, homeowners interested in treating trees along the street may do so with special permission from the Village forester.

As required by Ordinance Number: 8.24(7)(a), a Tree Work and Removal Permit is required prior to performing any of the following activities to public street trees:
  • Remove, destroy, cut, deface or injure any tree existing in the public area or attach any rope, wire, chain or sign.
  • Prune, fertilize or spray any tree or shrub in a public area.
  •  Place or maintain upon the ground in any public area any stone, concrete, brick or other impervious material or substance. 
For more information on EAB, and the Village's Urban Forestry program, please visit: