Between June 2024 and January 2025, US honey bee colonies suffered a record 62% die-off, surpassing the previous winter’s 55% loss.
USDA scientists detected viruses spread by varroa mites in nearly all dead colonies.
Every varroa mite tested showed resistance to amitraz, the last effective miticide available.
Amitraz resistance leaves beekeepers relying on harsher or less effective treatments, threatening bee health and crop pollination.
Experts recommend integrated mite management, including rotating miticides, sterilizing equipment, and isolating sick colonies.
RNA interference–based antivirals could protect bees from viruses in the future, but they are still years from deployment.
Adequate funding and resources for USDA and university labs are essential to prevent future mass die-offs.
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