Emerald Ash Borer (Agrilus planipennis) is a native wood boring insect to northern China, Korea, Japan, Mongolia and eastern Russia.
Image via: extension.iastate.edu
The emerald ash borer was first detected near Detroit, Michigan and in Windsor, Ontario during the summer of 2002. It has since spread to 17 states as well as Quebec. Evidence shows that EAB was introduced to Michigan during the early 1990s by transport of infested solid-wood packing materials from China. It is estimated to have killed tens of millions of trees thus far, and has the potential to devastate billions more.
For more read here.
Map is current as of May 2013.
This website is an excellent resource for all states and provinces currently challenged with EAB infestations.
This video by Graham Herbst of the Nebraska Forest Service depicts EAB’s spread throughout the States from 2002 to 2012.
Emerald Ash Borer Guelph 