Quick Summary
This small (0.39-0.51 inch, 10-13mm), metallic green boring beetle (Agrilus planipennis) serious damage to Ash trees. Beetle larvae develop under the bark as they feed on the tree. Initial attacks cause yellowing and thinning of foliage. Larval galleries grow, causing girdling and eventually tree mortality. EAB is currently NOT in California, but it is important to be vigilant of this fast-moving pest.
Emerald Ash Borer, Agrilus planipennis
Marianne Prue, Ohio Department of Natural Resources - Division of Forestry, Bugwood.org
What to look for:
- D-shaped exit holes from beetles
- Woodpecker damage from birds pecking for larvae
- Foliage that is yellow, thinning, or wilted
- Symptoms or mortality of ash trees in close proximity
Note: Transportation of firewood is a major source for spreading EAB
Emerald Ash Borer exit hole
David R. McKay, USDA APHIS PPQ, Bugwood.org
The current distribution map of this pest can be found here.
More Information and Resources:
UC Nursery and Floriculture Alliance. Insect Hot Topics: Emerald Ash Borer on the Move
Penn State Extension. Emerald Ash Borer Fact Sheets