In May 2014, the N.H. Division of Forests and Lands released parasitic wasps on the Forest Society's Merrimack River Floodplain Forest in Concord. These wasps prey exclusively on emerald ash borer, an invasive pest that is threatening to wipe out all true ash trees in North America.  Just this week, the entomologists came back and discovered early signs that the introduction was successful, and that these wasps were on their way to becoming established in New Hampshire.

Click below to read the full story from UNH Cooperative Extension: