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How to identify Emerald Ash Borer
Is My Tree Infested by EAB?

EAB only attacks ash trees. 
If your tree is not an ash tree, it will not be affected by EAB. 

 Ash trees have opposite branching – meaning branches come off the trunk directly across from each other. On older trees, bark has a tight, diamond-shaped pattern. Younger trees have relatively smooth bark. Use this University of MN Extension 
Ash Tree Identification Guide to help you determine if your tree is an ash tree.

Ash tree bark and leaf image at right, courtesy Tom DeGomez, U of Ariz.,

Symptoms of a possible EAB infestation of an ash tree

If you ash tree has one or more of the following symptoms, it may be infested by Emerald Ash Borer:

  • Bark flecking in the upper branches of tree. The flecking (light patches) may be caused by woodpeckers feeding on EAB and other insect larvae.
  • Severe die-back of tree's upper branches. Every tree has some dead wood but a lot of die-back could indicate an EAB infestation.
  • Bark cracks. EAB larvae tunneling under the bark can cause the bark to split open, revealing the S-shaped larval tunnels underneath.

Contact the City Forestry Staff at (952) 895-4508 if you have any questions.

EAB Adult Beetle Identification

EAB are invasive, non-native beetles that attack and kill ash trees.  EAB are native to eastern Asia but were discovered in Michigan and Ontario in 2002. The larvae (shown on the right) of these shiny green beetles tunnel beneath the bark of ash trees and gnaws away at the living tissue of ash trees until the tree eventually dies, usually 2 to 4 years after being infected. 

Not every green bug is an Emerald Ash Borer. Here is a guide to Insects in Minnesota that may be Confused with Emerald Ash Borer. Below is a side-by-side comparison of an Emerald Ash Borer and the Six-Spotted Tiger Beetle (native insect).

EAB vs SSTB.jpg


larvae_David Cappaert_Michigan State Univ_1460071-SMPT.jpg

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