EAB larva in wood

Emerald Ash Borer (EAB)

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Emerald Ash Borer (EAB) is an invasive beetle that kills ash trees. First detected in Minnesota in 2009, it reached Minnetonka in 2019 and is now widespread across the city. Most untreated ash trees are already infested. 

Minnetonka is at peak infestation

If your ash tree has not already been treated to resist EAB, starting treatment is no longer recommended. Removal is typically the safest and most cost-effective option, as dead ash trees quickly become brittle and hazardous.

Signs of emerald ash borer

  • Thinning canopy or dead branches
  • Increased woodpecker activity
  • Bark peeling (“blonding”)
  • S-shaped galleries under the bark
What residents should do
How the city manages emerald ash borer
The big picture
City responsibility vs. private property

Learn more

EAB spreads mainly through the movement of firewood, though it can naturally travel 1–2 miles per year.