Learn All About the Emerald Ash Borer

The emerald ash borer (agrilus planipennis or EAB) is the green beetle that is responsible for the destruction of hundreds of millions of ash trees in 15 states including PA. It is native to Asia.

It most likely arrived in the US hidden in wooden cargo pallets. The Emerald Ash Borer was first identified in Michigan in 2002. It is a wood boring insect that feeds under the bark of ash trees. It attacks the tree’s vascular system resulting in decline and death within a few years.

In the first 1-2 years, it is difficult to see any infestation or symptoms in infested trees. In the third year the tree shows significant dieback. By the 4th year after original infestation the tree will be dead. After 5 years the dead ash tree will become brittle and start dropping major limbs.

It is important to remember not to move firewood out of area to prevent the spread of this devastating insect.

Scientists have learned much about this insect and about methods to protect ash trees. Keep in mind, however, that controlling insects that feed under the bark with insecticides has always been difficult. It is important to remember that research on management of EAB remains a work in progress. More information, including pictures, can be found at