COVID-19 Information

Emerald Ash Borer

ST. PAUL, Minn. – The Minnesota Department of Agriculture (MDA) has identified an emerald ash borer (EAB) infestation in Chisago County along the Washington County border near Manning Trail. Two EAB adults were found on a purple EAB survey trap, and a follow-up visit discovered tunneling consistent with invasive pest in a nearby tree. 

Because this is the first time that EAB has been identified in Chisago County, specimens have also been sent to USDA for confirmation, which is expected early next week. Pending confirmation, the MDA and USDA will work closely to determine appropriate follow-up actions. 

Chisago County will likely be put under an emergency quarantine in the next week and eventually join Anoka, Dakota, Fillmore, Hennepin, Houston, Olmsted, Ramsey, and Winona counties in a state and federal quarantine. The quarantine is in place to help prevent EAB from spreading outside of a known infested area. It is designed to limit the movement of any items that may be infested with EAB, including ash trees and ash tree limbs, as well as all hardwood firewood.

Emerald ash borer larvae kill ash trees by tunneling into the wood and feeding on the tree’s nutrients. Since its accidental introduction into North America, EAB has killed tens of millions of ash trees in 24 states. The invasive insect was first discovered in Minnesota in 2009. The last county to be quarantined for EAB was Fillmore in April 2015.

Minnesota is highly susceptible to the destruction caused by EAB. 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 Minnesotans 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 and use the “Do I Have Emerald Ash Borer?” guide.

Guide to Insecticides:

Ash Tree ID:

Does My Tree Have EAB?:

EAB Look-alikes:

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