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Emerald Ash Borer
Agrilus planipennis
High threat
Metallic-green beetle whose larvae tunnel under ash bark, cutting off water and nutrients. Has killed hundreds of millions of ash trees across the U.S.
Identification Tips
- •Bright, metallic emerald-green body, about 1/2 inch long.
- •D-shaped exit holes in ash bark where adults emerged.
- •Bark splits and winding S-shaped larval galleries underneath.
Geographic Spread
Across most of the eastern and central U.S. and moving west. Spreads mainly via infested firewood.
Removal Guide
- •Report suspected infestations to your state agriculture department.
- •Treat high-value ash trees with a professional systemic insecticide.
- •Don't move ash firewood — chip or burn it locally.
Prevention
- •Buy and burn firewood locally — never transport it.
- •Watch ash trees for crown dieback and woodpecker activity.
- •Report any ash tree showing D-shaped holes or bark splits.
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