About this episode
Varroa mites remain the most destructive pest facing honey bees today—but a revolutionary new treatment may finally shift the balance. In this episode, Jeff Ott and Dr. Becky Masterman welcome Adam Pachl, North American Technical Manager for Bee Health at GreenLight Biosciences, to discuss Norroa, the first EPA-approved dsRNA-based treatment for Varroa mites. Norroa introduces a fundamentally new approach: instead of killing mites outright, it prevents them from reproducing. Adam explains how this RNA interference (RNAi) technology works at the molecular level, blocking the mites' ability to lay viable eggs without harming honey bees or other organisms. He also shares insights from years of field research, including trials across five U.S. states that demonstrated dramatic improvements in colony survival and mite suppression. Becky and Jeff explore the implications of this technology for beekeepers of all scales—from hobbyists managing a few hives to large-scale commercial operations—and how Norroa fits into an integrated pest management strategy. The discussion covers everything from timing of application, compatibility with other treatments, and safety testing, to potential future uses of RNAi against pests like Tropilaelaps. For the first time in decades, beekeepers may have a tool that targets Varroa precisely and safely—without collateral damage to the bees they're fighting to protect. Websites from the episode and others we recommend: GreenLight Biosciences. "GreenLight Biosciences Launches Norroa, the First RNA-Based Treatment for Varroa Mites." 25 Sep 2025. https://www.greenlightbiosciences.com/articles/greenlight-biosciences-launches-norroa-the-first-rna-based-treatment-for-varroa-mites GreenLight Biosciences. "In the Pipeline: Protecting the Honeybee." https://www.greenlightbiosciences.com/in-the-pipeline-protecting-the-honeybee GeneOnline. "EPA Registers Norroa as First RNA-Based Treatment for Varroa Mites Threatening Honeybee Populations." 25 Sept 2025. https://www.geneonline.com/epa-registers-norroa-as-first-rna-based-treatment-for-varroa-mites-threatening-honeybee-populations Honey Bee Obscura Podcast: https://honeybeeobscura.com Project Apis m. (PAm): https://www.projectapism.org Honey Bee Health Coalition: https://honeybeehealthcoalition.org The National Honey Board: https://honey.com Honey Bee Obscura Podcast: https://honeybeeobscura.com Copyright © 2025 by Growing Planet Media, LLC ______________ Betterbee is the presenting sponsor of Beekeeping Today Podcast. Betterbee's mission is to support every beekeeper with excellent customer service, continued education and quality equipment. From their colorful and informative catalog to their support of beekeeper educational activities, including this podcast series, Betterbee truly is Beekeepers Serving Beekeepers . See for yourself at www.betterbee.com This episode is brought to you by Global Patties ! Global offers a variety of standard and custom patties. Visit them today at http://globalpatties.com and let them know you appreciate them sponsoring this episode! Thanks to Bee Smart Designs as a sponsor of this podcast! Bee Smart Designs is the creator of innovative, modular and interchangeable hive systems made in the USA using recycled and American sourced materials. Bee Smart Designs - Simply better beekeeping for the modern beekeeper. Give your bees a boost with HiveAlive! Proven to increase bee health, honey yield, and overwinter survival, HiveAlive's unique formula includes seaweed, thyme, and lemongrass, making it easy to feed. Choose from HiveAlive's Fondant Patties, High-Performance Pollen Patties, or EZ Feed Super Syrup—ready-to-use options for busy beekeepers. Buy locally or online. HiveIQ is revolutionizing the way beekeepers manage their colonies with innovative, insulated hive systems designed for maximum colony health and efficiency. Their hives maintain stable temperatures year-round, reduce stress on the bees, and are built to last using durable, lightweight materials. Whether you're managing two hives or two hundred, HiveIQ's smart design helps your bees thrive while saving you time and effort. Learn more at HiveIQ.com . Thanks to Strong Microbials for their support of Beekeeping Today Podcast. Find out more about their line of probiotics in our Season 3, Episode 12 episode and from their website: https://www.strongmicrobials.com Thanks for Northern Bee Books for their support. Northern Bee Books is the publisher of bee books available worldwide from their website or from Amazon and bookstores everywhere. They are also the publishers of The Beekeepers Quarterly and Natural Bee Husbandry . _______________ We hope you enjoy this podcast and welcome your questions and comments in the show notes of this episode or: questions@beekeepingtodaypodcast.com Thank you for listening! Podcast music: Be Strong by Young Presidents ; Epilogue by Musicalman ; Faraday by BeGun; Walking in Paris by Studio Le Bus ; A Fresh New Start by Pete Morse ; Wedding Day by Boomer ; Christmas Avenue by Immersive Music ; Red Jack Blues by Daniel Hart ; Original guitar background instrumental by Jeff Ott. Beekeeping Today Podcast is an audio production of Growing Planet Media, LLC ** As an Amazon Associate, we may earn a commission from qualifying purchases Copyright © 2025 by Growing Planet Media, LLC