The emerald ash borer (EAB), a species native to Asia, apparently arrived in North America in ash wood used for shipping purposes. Discovered in Michigan in 2002, this invasive species is highly destructive to North American ash trees. The arrival and spread of these beetles has prompted many states and provinces to set up EAB programs to protect their ash trees and the ecosystems that depend upon them.
Image Credit: Pennsylvania Department of Conservation and Natural Resources—Forestry Archive. CC BY 3.0 http://creativecommons.org/licenses/by/3.0, via Wikimedia Commons.