See image slide show below.
- Adult emerald ash borers are 1/4 to 1/2 inches long, narrow and bullet shaped with a flat back.
- Adults are metallic in color with purple/red metallic abdominal segments beneath their wing covers.
- Larvae can get up to 3 cm in length and are a creamy white color with no legs.
- Larvae body is made up of flattened, bell-shaped segments.
- Attacks all species of ash trees.
SIGNS AND SYMPTOMS
- Adult beetles emerge in late May/early June
- Bark splitting
- S-shaped tunnels behind outer bark
- D-shaped exit holes 1/8" wide on bark surface
- Woodpecker flecking
- Dead top branches of ash trees
- Leafy offshoots from the lower trunk of ash trees
Emerald ash borer can be confused with many native insects. Check out these native look-alikes.
HOW TO IDENTIFY AN ASH TREE
In Vermont, we have three species of ash trees: green ash (Fraxinus pennsylvanica), black ash (Fraxinus nigra), and white ash (Fraxinus americana). Here are some helpful links for ash tree identification:
Kenneth R. Law, USDA APHIS PPQ, Bugwood.org
Kelly Oten, North Carolina Forest Service, Bugwood.org
Daniel Herms, The Ohio State University, Bugwood.org
Nathan Siegert, US Forest Service