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Norwalk Tree-Lovers Should Keep Eye Out For Emerald Ash Borer

The emerald ash borer leaves D-shaped holes n the bark of the tree, magnified in size in this image. Photo Credit: Norwalk Tree Alliance
The Emerald ash borer projects a green luminosity. Photo Credit: Norwalk Tree Alliance

NORWALK, Conn. -- Though there hasn't been confirmed evidence of the bug in Norwalk -- yet -- the emerald ash borer likely is lurking on local foliage.

So says the Norwalk Tree Alliance, a volunteer organization interested in promoting healthy forests.

The EAB -- as the invasive beetle is commonly abbreviated -- is ravaging ash trees across the Eastern United States. At an official level, the EAB has not been detected in Norwalk. 

But, citing field research conducted seasonally by Connecticut scientists who study insects, the Norwalk Tree Alliance considers it highly probable the beetle has spread to Norwalk’s ash trees.

Alliance members say it has been found in the neighboring communities of Westport and Wilton. The bug measures less than a half-inch in length and is distinguished by its glossy, metallic-looking green wings and a kind of luminosity. Only ash trees are vulnerable to attack by this particular beetle.

In some instances, to save a tree, a chemical treatment can be sprayed or a systemic drench applied to the roots. But the tree alliance suggests a licensed arborist be consulted before any treatment. Letting nature take its course will inevitably lead to the destruction of the tree. 

How do you know if the EAB has reached your area? Because of their tiny size, they are difficult to pick out visually. But you can bet they've been feasting on one of your trees if you find D-shaped holes in the bark no more than 1/8-inch in diameter.

So far the beetle has been detected in at least one-third of Connecticut’s 169 communities since 2012. State officials expect them to travel fast.

You can help stay on top of this nuisance. If you detect the presence of the insect, contact the Norwalk Tree Alliance at Please give specifics and attach any photos.

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