Spring 2014: Wisconsin EAB Alert!

Emerald Ash Borer in Wisconsin Counties

Emerald Ash Borer larvae in Wisconsin Ash treeYou may or may not have an ash tree on your property. However, since ash trees make up about 20% of the trees in Wisconsin, they are in your neighborhood and we feel compelled to make sure you have the facts about EAB. Emerald as borer (EAB) is a very serious problem that threatens all ash trees in the Midwest. The first discovered EAB in Wisconsin was in 2008. The Emerald ash borer is now found extensively in southeast Wisconsin and northern Illinois. A commonly asked question is, “What can I do to keep my ash tree?”

The answer to this question may vary somewhat depending on your individual circumstance. Much has been learned about this insect over the last several years, and new research continues to help us make better decisions regarding treatments to save ash trees. One thing is certain: treatment is required to keep you ash tree protected.

Points to Consider:

  • Serious consideration should be given to healthy, high value, important trees for treatment: i.e., specimen trees, ones shading key areas, sentimental, etc.
  • Trees should be healthy. Ashes have many other potential health problems other than EAB. This helps to ensure the treatments will be as effective as possible.
  • EAB has now been confirmed in 21 Wisconsin counties, including Kenosha, Racine, Walworth, Milwaukee, Ozaukee, Washington, Waukesha, Dodge, and Dane, and west all the way to LaCrosse.
  • Research has shown trunk injections with Emamectin Benzoate “Tree-äge®” performed every other year have been up to 99% effective, even in locations with high EAB populations.
  • Soil treatments are effective in certain situations. As new products and research emerge, recommendations may shift as necessary. Spring soil injections tend to be more effective than fall injections.
  • Another strategy is to remove small and/or poor quality ash trees and plant new trees.

Spring EAB Treatment in Wisconsin Helps save Your Ash Tree

When should treatment be started? Studies have shown protection prior to EAB discovery is most effective. Keep in mind everywhere EAB has been found, it had been present for 3 to 6 years before discover! In summary, the earlier treatments begin the better chance you have of saving your tree from damage. For more information about the Emerald Ash Borer in Wisconsin, visit the Wisconsin Department of Natural Resources EAB webpage, the UW-Madison EAB Research page, or talk to one of our Waukesha certified arborists today.

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