Signs of the emerald ash borer on a tree trunk
Pictured at left are the remnants of an ash tree after being infested by an insect known as the emerald ash borer. Since the emerald ash borer was first found feeding on trees in southeastern Michigan in 2002, this Asian invader has been responsible for the death of 30 million trees in the northeastern U.S. and Canada. In Chicago, where the emerald ash borer is already destroying trees, 17 percent of the street trees are ash—85,000 trees, with an estimated 300,000 more ash trees on private property. New research suggests that woodpeckers find this insect to be a handy food source and may slow the spread of this noxious pest, possibly even controlling it.
Image credit: Sonya Booth