Minnesota Department of Agriculture Plants, Insects Pest Management Biological Control of Emerald Ash Borer Biological Control of EAB Learn how biological control helps manage emerald ash borer. Parasitoid Wasps Learn about the three species of parasitoid wasps used to reduce EAB populations. Biocontrol Releases Discover how the MDA uses USDA-reared parasitoid wasps to manage and control EAB infestations. Biocontrol Recovery Explore the methods used to recover and monitor parasitoid wasps released for EAB biological control. Research & Implementation Explore research projects and key findings from EAB biocontrol efforts in Minnesota.