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The original item was published from 1/13/2021 12:01:30 PM to 1/13/2021 12:02:42 PM.

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Posted on: January 13, 2021

[ARCHIVED] Emerald Ash Borer Discovered in Chanhassen

EAB Confirmed

Chanhassen, Minn., January 13, 2021 - The Minnesota Department of Agriculture (MDA) has alerted the City of Chanhassen that emerald ash borer (EAB) was discovered in an ash tree located inside city limits after finding woodpecker damage, bark cracks and telltale S-shaped tunnels under the bark.

Around 20% of the public trees in the City of Chanhassen are ash.  That percentage is higher for the private trees in town, with some yards having nearly 100% ash trees.  The City strongly encourages residents to educate themselves about EAB and help slow its spread.

This is the perfect time of year to look for woodpecker damage and other signs of emerald ash borer because the tree limbs are bare and can be easily seen.  There are several things residents should look for when checking for emerald ash borer:

    Be sure you’ve identified an ash tree. This is an important first step since EAB only feeds on ash trees. Ash 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 relatively smooth bark

    Look for woodpecker damage. Woodpeckers like EAB larvae and woodpecker holes may indicate the presence of EAB. Use binoculars to look high into the canopy

    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. Tree professionals that are licensed by the MDA are educated in the proper identification and handling of ash trees.  For a list of these contractors please visit:                                 

Emerald ash borer 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 because 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 like Caver County, be aware of the restrictions on movement of products such as ash trees, wood chips, and firewood

    Watch your ash trees for infestation. If you think your ash tree is infested, go to and use the guide “Does my tree have emerald ash borer?”

Please visit the City of Chanhassen’s web page for additional information concerning EAB management:

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