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Wasps that attack the emerald ash borer are establishing in Minnesota


Jered Bourquin peeled and examined ash trees to look for the larvae of wasps that attack emerald ash borer.

Jered Bourquin peeled and examined ash trees to look for the larvae of wasps that attack emerald ash borer.

One year after the release of wasps that attack emerald ash borer (EAB), crew member Jered Bourquin recently found the wasps’ larvae at Great River Bluffs State Park on the Mississippi River southeast of Winona. He found the larvae while peeling and examining ash trees at the park, which shows the species, Tetrastichus planipennisi, survived the record-cold winter of 2014 and is becoming established in the EAB population. Though it will take several years to build a significantly measurable population, the finding was a good signifier.

This collaborative effort, with the Minnesota Departments of Agriculture (MDA) and Natural Resources and U.S. Department of Agriculture, is supported by the Environment and Natural Resources Trust Fund as recommended by the Legislative-Citizens Commission on Minnesota Resources.