VIDEO: Government unleashes lab-grown wasps on St. Joseph Island

But they're not the kind that will ruin your picnic

The emerald ash borer is a devastating invasive beetle which has killed millions of ash trees in Canada and the United States since it was discovered here in 2002. In response to this threat, Canadian Forest Service is using a biological control program against this invasive pest in an attempt to limit or slow its continued spread and impact.

This week, parasitic wasps, grown locally at the Great Lakes Forestry Centre, were released at Fort St. Joseph National Historic Site.