Emerald Ash Borer

"The emerald ash borer (EAB), Agrilus planipennis, is a very destructive insect pest of ash trees (Fraxinus spp.), the only known hosts of this borer in North America. This exotic borer is a native of Asia with its natural range including China, Japan, Mongolia, Korea, the Russian Far East and Taiwan. 

It was first discovered in North America in southeast Michigan in June, 2002, although it was likely introduced as much as 10 years earlier. It was first found in Minnesota in May 2009, in St. Paul. EAB has also been found in many other U.S. states. It has also been discovered in the Canadian provinces of Ontario and Quebec." - Emeral Ash Borer in Minnesota (attached guide below)