Emerald ash borer (Agrilus planipennis) is an insect pest of Ash. It is a native of Asia and was first detected in Michigan in 2002.
EAB moves less than 3 miles per year on its own. The main reason it is spreading across the Midwest is people moving infested firewood. If people would dispose of infected trees on site rather than taking wood camping with them the problem would not have spread. This is just one of many forest pests that are moved to un-infested forests by humans moving firewood. Help to protect our forests: dont move firewood!