About the Emerald Ash Borer
The Emerald Ash Borer (EAB) is a beetle native to Asia that was first detected in the United States in Michigan in 2002. It has since been detected in 31 states, including Pennsylvania, and locally in Upper Merion Township. The beetle larvae feed on the inner bark of ash trees, disrupting the tree’s ability to transport water and nutrients, and killing ash trees within three to five years after infestation.
In addition to spreading by natural means, EAB can be transported to new areas in infested firewood, timber, and nursery stock. It has been responsible for the loss of millions of ash trees in North America.
Signs & Symptoms
New infestations are difficult to detect, as damage to the tree may not be apparent for up to three years.
Symptoms of an infestation can include:
- Branch dieback in the upper crown
- Excessive epicormic branching/sprouts on the tree trunk
- Vertical slits or bark flaking caused by woodpeckers
- D-shaped adult beetle exit holes in the bark