Ash tree threats

I have a number of ash trees on my property, and recently someone told me there was some kind of a bug or beetle that is killing them. One of those things brought in. Does anyone know what that bug or beetle is called?

Emerald Ash Borer Threat: Invasive Asian Beetle Poses Danger to Ash Trees

Thanks so much for the info. Those little buggers look like they are real pests. I hope that someone figures out a way to get ride of them before they kill all of our ash trees.