Emerald ash borer (EAB)

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Emerald ash borer (EAB) is a nonnative invasive insect that destroys ash trees. A quarantine has been placed on Ramsey, Hennepin, Houston, and Winona counties to help slow the spread of EAB to other areas. It's against the law to move the following items out of EAB-quarantined counties:

  • Firewood from hardwood trees
  • Entire ash trees
  • Ash limbs and branches
  • Ash logs or untreated ash lumber with bark attached
  • Uncomposted ash chips and uncomposted ash bark chips greater than 1 inch in two dimensions.

Locations of EAB


photo: Signs and symptoms of EAB

What you need to know

EAB kills ash trees, and it does so in great numbers. Already it has killed millions of ash trees in North America pdf. EAB will have a huge effect on Minnesota's landscape and the 998 million ash trees that grow in our cities and forests.

  • Recognize the signs of an EAB-infested tree: heavy woodpecker activity on tree, dying branches in the top canopy, sprouts around the tree base, vertical cracks in the bark, S-shaped tunnels under the bark, and 1/8-inch D-shaped exit holes in the bark.
  • If you think your tree is infested with EAB, complete the steps outlined in Step Through Guide external linkpdf?and refer to the Signs and Symptoms of EAB in Ash Trees slide show for more examples. Also review the reference for recognizing insect galleries?external linkin ash trees in Minnesota.
  • If your ash tree is showing other signs, visit the What's wrong with my ash tree??external linkonline diagnostic tool to help identify problems caused by insects, diseases, and nonliving factors.
  • To report a possible EAB infestation, contact the Arrest the Pest Hotline at arrest.the.pest@state.mn.us external linkor 888-545-6684.
  • Consider insecticide treatments only when your property is within 15 miles of an EAB infestation. More information ?external link
  • Do not transport firewood, even within Minnesota.

 

EAB information available in Spanish and Hmong.

graphic:EAB icons