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EAB found in Duluth

 Jeffrey Hahn, Extension Entomologist

(The following information is taken from an October 23, 2015 news release from the Minnesota Department of Agriculture)

The Minnesota Department of Agriculture (MDA) last Friday identified emerald ash borer (EAB) in the city of Duluth (St. Louis County). Finding EAB in Duluth is not a surprise as Superior, Wisconsin, just across the state border from Duluth, confirmed EAB in August, 2013.

MDA staff found EAB larvae in an ash trees on Park Point. The find was discovered as part of a three-year
EAB was found in Duluth by sampling branches by
bark peeling.  Photo - Jeff Hahn, UMN Extension
study the MDA is conducting in partnership with the city. The study is evaluating different methods for finding EAB, and one of those methods is removing samples of branches from ash trees to peel back the bark and look for signs of the insect. MDA staff found evidence of EAB in four of 35 trees sampled in this way.

Because this is the first time that EAB has been identified in St. Louis County, the specimen have been sent to the United States Department of Agriculture (USDA) for confirmation, which is expected within days.

MDA will be implementing an emergency state quarantine of Park Point in Duluth. A quarantine is designed to help prevent EAB from spreading outside of a known infested area by limiting the movement of any items that may harbor EAB, including ash trees and ash tree limbs, as well as all hardwood firewood.

St. Louis County becomes the 12th county in Minnesota to verify EAB. EAB was also confirmed in 2015 for the first time in Scott, Chisago, Fillmore, Anoka, and Washington Counties. This invasive beetle has also been found in Hennepin, Houston, Olmstead, Ramsey, and Winona counties. These counties are all under quarantine.

The biggest risk of spreading EAB comes from people unknowingly moving firewood or other ash products harboring larvae. Take these steps to minimize spreading EAB: 
  • 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. 
  • 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.
For more information about EAB, see Emerald ash borer in Minnesota. See also the MDA news release, MDA identified emerald ash borer in the city of Duluth.

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