News Flash


Posted on: July 14, 2022

Emerald Ash Borer (EAB) Discovery

Along with City Staff the Minnesota Department of Agriculture (MDA) confirmed an emerald ash borer (EAB) infestation within our community. A concerned citizen reported an ash tree with bark cracks and damage in the tree canopy, a tell-tale sign of possible EAB infestation. 

There are several things’ residents should look for when checking for EAB. 

  • Be sure you’ve identified an ash tree. This is an important first step since EAB only feeds on ash trees. Ash trees have opposite branching – meaning branches come off the trunk directly across from each other. On older trees, the bark is in a tight, diamond-shaped pattern. Younger trees have a relatively smooth bark.
  • Look for woodpecker damage. Woodpeckers like EAB larvae and woodpecker holes may indicate the presence of EAB.
  • Check for bark cracks. EAB larvae tunneling under the bark can cause the bark to split open, revealing the larval (S-shaped) tunnels underneath.
  • Contact a professional. If you feel your ash tree may be infested with EAB, contact the Public Works Department (507-934-0670) or a professional tree care provider, or the at MDA or 888-545-6684 (voicemail).

 Emerald ash borer (EAB) larvae kill ash trees by tunneling under the bark and feeding on the part of the tree that moves nutrients up and down the trunk. Minnesota is highly susceptible to the destruction caused by this invasive insect. The state has approximately one billion ash trees, the most of any state in the nation. 

The biggest risk of spreading EAB comes from people unknowingly moving firewood or other ash products harboring larvae. There are three easy steps residents can take to keep EAB from spreading:

  • Don’t transport firewood. Buy firewood locally from approved vendors, and burn it where you buy it;
  • Be aware of the quarantine restrictions. If you live in a quarantined county, be aware of the restrictions on movement of products such as ash trees, wood chips, and firewood; and,
  • Watch your ash trees for infestation. If you think your ash tree is infested, go to for resources on identifying EAB, how to hire tree care professionals, and insecticide options for protecting your ash tree. 

For more information on emerald ash borer, go to and watch the video created by the City of Saint Peter.


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