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Emerald Ash Borer

The emerald ash borer, which was first discovered in the U.S. over ten years ago, was found in Dane County in the fall of 2013. This insect has been responsible for killing thousands of ash trees across the eastern part of the U.S. and is slowly spreading west across the United States.

Emerald ash borers kill only ash trees, including green, white, blue, and black species of ash (Fraxinus, sp). This insect does damage in its larval stage by feeding on the cambium tissue under the bark of ash trees, which disrupts water and nutrient transport, eventually causing crown thinning, branch dieback, and death of the tree.  Tree death can occur in 2-3 years after the infestation occurs.

Treatment
Our approach to treating EAB is to be proactive. We recommend treating ash trees BEFORE they become infested. If trees are 30% or more infested and/or exhibit visible canopy decline, control of EAB with any product will be reduced due to impaired translocation throughout the vascular system of the tree. A preventative treatment regimen will greatly reduce the likelihood of your ash trees becoming infested by EAB. The time to begin treatments is in the spring. Due to the high infestation rate, Barnes Inc., recommends treating ANNUALLY.

If trees are not healthy and/or have physical and structural defects, we recommend removing and replacing them, possibly with a different species. Unhealthy, untreated trees will harbor the insect and allow it to reproduce and spread to other areas. Our professional arborists can evaluate the health of your ash trees and decide if your ash trees are healthy and structurally sound enough for treatment and provide you with options. Since trees take a very long time to mature, it is a very good decision to remove and replace unhealthy ash trees.

There are 3 treatment options for EAB, and their specific uses depend on site conditions, length of effective of control desired and cost.

1. Barnes, Inc. recommends an organic option, derived from the neem tree, which is native to India and Pakistan. According to UW Madison and University of Minnesota research, this product is as effective as other, less safe methods, and provides one year of control of EAB while being competitively priced. These factors, taken together, make this the best option for all situations.

2. Tree-age (pronounced as “triage”) is a chemical option that contains emamectin benzoate as its active ingredient. This product provides two years of preventative control of EAB.

3. Imidicloprid is the active ingredient in the third option, which provides only one year of control, therefore needs to be applied every year for continuous control. This product also has labeled rate restrictions due to its potential environmental impact.

EAB IN THE NEWS:

Contact the tree experts about Emerald Ash Borer

Click here to learn more about the environmental impacts and efficiency of TreeAzin systemic insecticide.

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