Biological control is considered the primary long-term management tool to suppress emerald ash borer (Agrilus planipennis) in forested ecosystems. One egg parasitoid (Oobius agrili) and three larval parasitoids (Tetrastichus planipennisi, Spathius galinae and S. agrili) have been approved for biological control of EAB in North America. The URI Biocontrol Lab is currently releasing O. agrili, T. planipennisi, and S. galinae to combat EAB in Rhode Island. Long-term release sites will be continually monitored to determine the impact of these biocontrol agents. For more information, see this USDA publication on the role of biocontrol protecting ash regeneration after EAB invasion