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Emerald Ash Borer

Emerald Ash Borer

Emerald Ash Borer

What you’ll see… infestations of Emerald Ash Borer can be difficult to detect until canopy dieback begins however one way to tell if the adults are present is to look at the leaves checking for any signs of chewing. Evidence of trunk infestation include D-shaped exit holes on branches and the trunk, vertical splits in the bark, discolored sapwood, distinct serpentine tunnels in sapwood and a profusion of epicormic shoots. Many trees appear to lose about 30 to 50 percent of the canopy in one year and the tree is often killed after 2 to 3 years of infestation.

The reason for the problem… In 2003, a new exotic beetle from Asia, was inadvertently introduced to southeast Michigan and began feeding on Ash trees. It has been identified as Agrilus planipennis. Larvae feed in the phloem and outer sapwood, producing galleries that eventually girdle and kill branches and entire trees. This insect isn’t considered a pest in China since it has plenty of predators that keep it under natural control however in the U.S. very few predators exist allowing it to quickly dominate its host.

You should… Remove any dead or dying branches and the tree if infestation is too severe. It is unlawful to remove the wood from Michigan.

We can help … if the tree is not heavily infested. Prevention is the key! Action must be taken before it’s too late! We offer treatments which can control the Emerald Ash Borer in the early and even later stages of infestation. Ash trees can still be found in southern Michigan especially those that were injected before it was too late. In northern Michigan Emerald Ash Borers are now causing considerable damage but when treated in advance or before major damage they can be saved. The cost to inject and save for 5 years is still cheaper then the cost to remove and replace. Contender’s tree experts do not drill trees! We will use fine needles allowing the trunk to recover much quicker. We guarantee our Ash tree injections 100%!


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Posted on: August 4, 2015

What you’ll see…is wilting leaves and dieback of branches, often one at a time or on one side of the tree. This can occur over a number of years, with remiss...

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