Stingless wasps are a natural enemy of the EAB. The U.S. Department of Agriculture is working with the Forest Service and Agricultural Research Service (ARS) to raise and harvest these stingless wasps for monitored releases in selected EAB infested locations. Specifically, they are using three parasitoid species of wasps from China called Spathius agrili, Tetrastichus planipennisi and Oobius agrili.
The wasps target EAB eggs and larvae and use them as hosts to support their own species. The wasps’ offspring consume the EAB egg and larvae as they grow and develop. This year, wasps were released in 17 states: Connecticut, Illinois, Indiana, Kentucky, Maryland, Massachusetts, Michigan, Minnesota, Missouri, New York, North Carolina, Ohio, Pennsylvania, Tennessee, Virginia, West Virginia and Wisconsin. Additional parasitoid releases are expected in EAB-infested States when appropriate climate/release conditions are met. Read more here.