Emerald Ash Borer
The emerald ash borer is an invasive beetle that attacks and kills ash trees. It is now present in Maine and poses a serious threat to ash trees in Bath and across the region.
What is the Emerald Ash Borer?
The emerald ash borer is a small, metallic green beetle. Its larvae live beneath the bark of ash trees, where they disrupt the tree’s ability to move water and nutrients. Most untreated ash trees die within two to four years of infestation.
Why it matters
Ash trees are an important part of Bath’s urban forest. They provide shade, help manage stormwater, support wildlife, and contribute to the character of our neighborhoods. The spread of emerald ash borer may lead to the loss of tree canopy, increased tree removal costs, and changes to streetscapes, parks, and natural areas.
Signs of infestation
Emerald ash borer damage can be difficult to spot in the early stages. Common signs include:
- Thinning or dying branches in the upper canopy
- D-shaped exit holes in the bark
- S-shaped tunnels beneath the bark
- Increased woodpecker activity
- New sprouts growing from the base of the tree
What residents can do
Check your trees
If you have ash trees on your property, watch for signs of infestation and declining tree health.
Do not move firewood
Moving firewood can spread invasive pests. Buy and burn firewood locally whenever possible.
Consider treatment or removal
Some healthy ash trees may be candidates for treatment by a licensed arborist. Dead or heavily infested trees may need to be removed for safety.
Report concerns
If you suspect an ash tree on City property may be infested, please contact the Forestry Division. The Forestry Division is only able to respond to concerns about trees on public property and cannot assist with trees located on private property. For trees on private property, please contact a licensed arborist for evaluation and next steps.
Report a Concern
What the City is doing
The City of Bath is taking a proactive approach to managing emerald ash borer. Current efforts include inventorying ash trees on public property, prioritizing high-value trees for treatment, planning for phased removal and replacement, and expanding tree diversity to strengthen the urban forest over time.
Learn more