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Ash Tree Disease Chicago Illinois

An example of a D-shaped emergence (or exit) hole. The very small hole (1/8 of an inch) is a sign of emerald ash borer infestation. NOTE: other wood boring beetles also leave exit holes in trees. The tiny size AND D-shape are characteristic of EAB. An example of a D-shaped emergence (or exit) hole. The very small hole (1/8 of an inch) is a sign of emerald ash borer infestation. NOTE: other wood boring beetles also leave exit holes in trees. The tiny size AND D-shape are characteristic of EAB.[/caption]

 

How Do I Know If My Trees Have EAB?
Emerald Ash Disease Chicago

Symptoms

Emerald Ash Borer
The Emerald Ash Borer is an exotic beetle from Asia which has now been found in Chicago Illinois.  The Emerald Ash Borer, although small, approximately 1/2 an inch, can fly up to a mile from where it emerges.

Exit Holes in Tree 

D-shaped exit holes can be found on trees where the adult beetles emerged.  A tree with these holes has been infested for at least one year.  They will be present on the branches and the trunk.
“Suckers” Develop 

“Suckers,” or new sprouts, may develop around the bottom of the main trunk of an infested tree.  They can grow until they are 2-3 inches in diameter and are again attacked by the Emerald Ash Borer.
Thinning Canopy 

Tree canopy will begin thinning and branches will die.  First there will be yellowing of the leaves, then dead branches.  The thinning will begin at the top third of the tree, then spread over time.  Usually, a tree will live 2-4 years after thinning at the top of the tree occurs.
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