How to Identify an Ash Tree

Ash trees are fairly common landscape trees in Fitchburg, both on residential and commercial properties. Make use of one or more of the following easy, reliable ways to determine whether you have an ash tree on your property:

  1. Watch a video: How to Identify an Ash Tree
  2. Print one or both of these illustrated guides on ash identification: Illustrated Guide to Ash Identification-1 and Illustrated Guide to Ash Identification-2
  3. Pick up a wallet-size, laminated card on ash identification on the kiosk in the City Hall entranceway. (Cards showing signs and symptoms your ash is infested with EAB also are available.)
  4. If you remain unsure whether you have an ash tree, contact the City Forester at 270-4289 or

Important Points:

  • EAB will attack and kill any native North American species of true ash. You do not need to determine whether you have a white ash (Fraxinus americana) or green ash (Fraxinus pennsylvanica). Black ash (Fraxinus nigra) is native to Wisconsin but rarely used as a landscape tree. Blue ash (Fraxinus quadrangulata) is not native to Wisconsin and not planted here as a landscape tree.
  • EAB will attack any ash tree on your property, regardless of its health condition, size, age, or location.
  • EAB attacks only true ash species. It does not attack any other tree species, including mountain ashes. Despite their ash-like leaves, mountain ashes belong to the genus sorbus and are members of the rose family. American mountain ash (left) and European mountain ash (right) are characterized by orange-red berries in autumn.
Ash Tree

American Mountain Ash

Mountain ash

European Mountain Ash

sorbus aucuparia