Emerald ash borer update

Emerald Ash Borer has continued to spread in Southeastern Wisconsin - Know the facts.

The emerald ash borer is a serious threat to ash trees.  It is an invasive, wood-boring beetle that kills healthy and stressed ash trees alike.  EAB continues to spread throughout our area.  The list of communities with known outbreaks continue to grow.  In Southeastern Wisconsin, EAB has been confirmed in 21 distinct munipalities in Milwaukee, Ozaukee, and Waukesha Counties. 

Emerald ash borers are an exotic Asian insect that first showed up in Michigan in the early 2000's. It was first  detected in Wisconsin in Newburg on the Ozaukee-Washington county line in 2008.

  Ash Leaf


How do you know if a tree has EAB?

It is very difficult to detect EAB early on in an outbreak. As a tree declines, the signs become much more apparent.  The tree gradually dies within 2-4 years.  Usually an ash tree declines from the top of the tree downward.  Pockets of bark start to lighten and turn whiteish.  Wood peckers tend to congregrate on EAB infested trees .  As the bark starts to peel off the tree, the tell tale signs become easier to see.  Look for D-shaped exit holes made by adult emerald ash borer as it emerges from the ash tree.  Also look for the S-shaped galleries or tunnels made by EAB larvae feeding under the bark of the ash tree. Their feeding cuts off the flow of water and nutrients within the tree. 

Emerald Ash Borer larval galleries  (s- shaped)

Treatments are available

Ash trees are very numerous in Southern Wisconsin, and widespread on many public and private properties.  It is important to decide if and how you want to manage the ash trees on your property.  Hoppe Tree Service can help you develop an informed strategy that fits with your goals.  Each client and each property is different, and a variety of techniques can be used. Treatment options are available and include two different types of methods.  Soil injected systemic insecticide, or trunk injected insecticide.  Each option has its merits.

Soil systemic insecticide- Treatment generally takes place in the spring and fall.  Insecticide is pumped into the ground to the root zone of the ash tree using a soil probe and a pressurized tank.  Treatments are persistent in the tree for about 1 year and need to be repeated annually.  Soil insecticide treatments tend to work best for smaller diameter trees.  (less than 15" diam)

Trunk injection (TREE-AGE) - This treatment is a stronger, faster working product than the soil insecticide treatment.  Small injection sites are drilled into the trunk of the tree. Once the insecticide treatment is pumped into the tree,  it acts systemically through the vascular system of the tree.  Treatments are persistent for 2 years and are usually used on larger diameter ash trees (greater than 15" diam).

  Non treated and treated ash trees side by side.

Removal/replanting- This option can be used to remove trees that are of poor quality.  On properties with numerous ash trees, it may be a smart idea to remove some of the ash trees over time and replant with different trees.  This can be incorporated into a long term approach to create a more diversified forest. A healthy landscape contains trees of a variety of species and ages.   

Long term planning should be incorporated into all landscape settings.  In some cases treatments may perhaps only be temporary while new younger non-ash trees are given a chance to grow.  Larger properties may want to incorporate a diversified management plan that utilizes all three methods.  

Hoppe Tree Service arborists can help you decide a management strategy  to decide if your trees should be treated.  We recommend treating high value trees that have importance in the landscape.  When you work with Hoppe Tree Service you benefit from having trained, educated and certified professionals caring for your trees. We will also help you make decisions about your trees.  Our staff includes, certified Arborists and licensed pesticide applicators  trained in the progressive technologies and techniques that can spot potential  tree health issues early. 

Prevention is the key– Hoppe Tree Service can develop a strategy to keep your trees healthy, safe and happy. 

More information on Emerald Ash Borer insect can be found at Wisconsin's Emerald Ash Borer Information Source website, sponsored by the Wisconsin Department of Agriculture, Trade and Consumer Protection. (DATCP)

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