Riverside, Ohio
3400 River Rd.
Cincinnati, OH 45204

Emerald Ash Borer June 4, 2015

Riverside, Cincinnati
Emerald Ash Borer, Cincinnati, Ohio

Emerald ash borer (EAB), a native beetle of Asia, invaded North America in the 1990's by way of wooden packing material. In a decade's time, these pests killed tens of millions of trees throughout the Great Lakes region. Get to know this pest, so you can sound the alarm if it makes its way to your neck 'o the woods.


The adult emerald ash borer is a striking metallic green, with an iridescent purple abdomen hidden beneath the forewings.

This elongate beetle reaches about 15 mm in length, and just over 3 mm in width. Look for adults from June to August, when they fly in search of mates.

Creamy white larvae reach lengths of 32 mm at maturity. The prothorax nearly obscures its tiny, brown head. EAB pupae also appear creamy white. The eggs are white at first, but turn deep red as they develop.

To identify emerald ash borer, you should learn to recognize the signs of an infestation. Unfortunately, symptoms of emerald ash borer don't become obvious until two or more years after borers enter a tree. D-shaped exit holes, just 1/8" in diameter, mark the emergence of adults. Split bark and foliage dieback may also portend pest trouble. Just under the bark, S-shaped larval galleries will confirm the presence of EAB.

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