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Ash Borer Infestation #681528 - Ask Extension


Ash Borer Infestation #681528

Asked February 23, 2021, 12:11 PM EST

My neighborhood’s trees have been infested by Emerald Ash Borers and we would appreciate any guidance you may have for us.

Talbot County Maryland

Expert Response

Emerald ash borer is in most areas of Maryland. Some signs of EAB include significant dieback in the canopy, woodpecker activity on the trunk and branches, D-shaped exit holes in the bark, and S-shaped galleries beneath the outer layer of bark. Here is more information and photos on the following pages.

If you see this, it is generally too late to treat the tree with an insecticide. It is a good idea to have the tree taken down by a licensed tree expert since ash trees become brittle quickly when they die and they can become hazardous. Typically we only recommend treatment if 1/3 or less of the canopy shows dieback symptoms. The tree would need healthy functioning tissue in order to transport the insecticide inside of it.

It is a good idea to have an onsite diagnosis by a certified arborist for the best way to proceed. 
You can find a certified arborist near you using the following website from the International Society of Arboriculture,

There are no specific guidelines for ash wood removal. A reputable tree company can take care of removal and disposal (usually they chip the wood). If you have a fireplace, you could burn the wood.


Marian Hengemihle Replied February 23, 2021, 12:59 PM EST

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