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Emerald Ash Borer Found in Isanti County

Emergency quarantine on wood movement put in place for southern portion of Isanti County


November 17, 2022

St. Paul, MN: The Minnesota Department of Agriculture (MDA) has confirmed the presence of emerald ash borer (EAB) in Isanti County for the first time. There are now 37 counties in the state, including Isanti, with EAB.

A tree care company contacted the MDA after suspecting a group of trees in Standford Township was infested with EAB. MDA staff were able to find EAB larvae and collect samples. There was also another pocket of infested trees found about a mile from the originally reported location. Federal identification confirmed emerald ash borer.

EAB was first discovered in Minnesota in 2009. The insect 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. Often, the trees show several signs of infestation because of this. Woodpeckers like to feed on EAB larvae, and woodpecker holes may indicate the presence of emerald ash borer. Also, EAB tunneling can cause the bark to split open, revealing characteristic S-shaped galleries underneath.

Because this is the first time EAB has been identified in Isanti County, the MDA is enacting an emergency quarantine of the southern portion of Isanti county south of State Highway 95, which limits the movement of firewood and ash material out of the area.

The MDA issues quarantines for all areas known to have EAB to reduce the risk of further spreading the tree-killing insect.

A virtual informational meeting for residents and tree care professionals in Isanti County will be held on Wednesday, November 30, 2022. Experts from the MDA will give a brief presentation followed by a question-and-answer session.

Emerald Ash Borer Virtual Informational Meeting

Wednesday, November 30, 2022

10-11 a.m.

Register at

The public will also have an opportunity to provide input on the proposal to add Isanti County’s emergency quarantine to the state’s formal quarantine. The MDA is taking comments on the proposed formal quarantine now through Dec 22, 2022 and recommends adopting the quarantine on January 3, 2023. The proposed quarantine language can be found at

Comments can be made during the virtual meeting or by contacting:

Kimberly Thielen Cremers

Minnesota Department of Agriculture

625 Robert Street North

St. Paul, MN 55155

There is more EAB information on the MDA website.


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