Oct 22, 2010 — The invasive Emerald Ash Borer is expected to kill off all ash trees across the U.S. That's according to Mark Whitmore. The Cornell University entomologist spoke with Jonathan Brown.

Whitmore's been studying this bug since it was first discovered in the U.S. in 2002. Since then, he says, it's torn through the Midwest and now surrounds the North Country.