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Environment & Climate

Queen bees survive pesticide exposure by offloading toxins into eggs, study finds

Researchers found that honeybee queens transfer accumulated pesticides into their eggs when worker filtration capacity is overwhelmed, posing risks to future offspring.

Updated Aug 24, 2026 · 00:33 UTC1 reports

The short version

  • A new study reveals that honeybee queens use maternal offloading to transfer accumulated pesticides out of their bodies and into their eggs.
  • The defense mechanism activates when worker bees become overwhelmed and can no longer filter out contaminants from the queen's food.
  • While the process helps the queen survive, researchers warn it could impair brood development and contribute to delayed colony collapse.
  • Scientists are working to determine how long queens can sustain this process and how impacts vary across different agricultural chemicals.

Key facts

  • In a study published in Current Biology, researchers from UC Davis, LLNL, and USDA-ARS documented maternal offloading in honeybee queens for the first time.[ScienceDaily]
  • Experiments using experimental nanocolonies revealed that worker bees filtered 95% of the pesticide methyl parathion on day one, but their filtration efficiency fell to 86% by day 10.[ScienceDaily]
  • Scientists utilized biological accelerator spectrometry (BioAMS) at Lawrence Livermore National Laboratory to track low, environmentally relevant, non-lethal concentrations of radioactively marked pesticides.[ScienceDaily]
  • Honeybee queens lay between 1,500 and 2,000 eggs daily to maintain worker populations critical for colony survival and agricultural pollination.[ScienceDaily]

What remains uncertain

  • It remains unknown how long queens can sustain the offloading of contaminants into eggs or what the specific long-term consequences are for overall colony health.[ScienceDaily]
  • Researchers have not yet determined whether maternal offloading functions similarly across different types of agricultural pesticides.[ScienceDaily]

Sources