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EAB Found Near Rochester

Jeffrey Hahn, Extension Entomologist

Jeff Hahn, Univ. of MN Extension

Photo 1: Watch for EAB and symptoms of infested trees. In this picture is an EAB larva the S-shaped tunnels it makes.

The Minnesota Department of Agriculture (MDA) announced earlier this week that emerald ash borer (EAB) has been confirmed in Olmstead County south of Rochester. Olmstead County is now the fifth county in Minnesota to confirm EAB (Ramsey, Hennepin, Houston, and Winona counties being the others). The infestation was found near the interchange of Interstate 90 and Highway 63, about 45 miles from the nearest known EAB infestation. It is believed that EAB were accidentally moved with human assistance into this area.

Because of this infestation, Olmstead County is now under Federal and State quarantine. This quarantine restricts the movement of ash material, including branches and logs, and all hardwood firewood. More information about the EAB quarantine and regulatory restrictions can be found here.

Jeff Hahn, Univ. of MN Extension

Photo 1: The best way to slow down EAB is to NOT move firewood. Buy it where you burn it!

It is critical that residents don't move firewood, especially out of quarantined areas. Buy firewood locally from approved vendors and burn it where you buy it. By itself, EAB only travels a mile or two a year. However, when people inadvertently move infested wood, EAB can travel many miles at a time.

People can also help in the fight against EAB by being familiar with what EAB looks like and the symptoms of infested trees.  Residents should report any insects suspected to be EAB or ash trees they believe are infested with EAB to the MDA; leave a voice message at 1-888-545-6684 or e-mail  

More information on EAB can be found on the Extension's EAB page.
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