Diet, Demographics Behind Late-Summer Wasp Outbreak on Prairies

A wasp hovers over a tulip on a warm spring day in Washington Park in Albany, N.Y., on May 2, 2013. The Canadian Press/AP, Mike Groll

Audric Moses has seen a few late-summer wasp outbreaks around his Edmonton home over the past seven years, but nothing like what he saw last week.

“My wife said, ‘Hey, come on out here. You need to see this,’” he said.