Chemical residues in declining commercial honey bee colonies.
Lamas ZS, Chen Y, Niño EL, Boncristiani D, Mayack C
Pollinators
Every squash, cucumber, and berry in your garden depends on honeybees making it through the season—and this study shows the chemicals harming them most aren't just coming from farm fields but from inside the hives themselves.
Researchers tested bee colonies that were dying off and found a cocktail of chemicals in the bees and their hive materials. Most came from treatments beekeepers use to fight mites, but one crop insecticide called imidacloprid stood out as especially dangerous—it accounted for nearly all the toxic risk calculated. Crucially, bees that were actively dying carried higher levels of acutely toxic chemicals than the general colony, suggesting standard hive surveys miss the worst-affected individuals.
Key Findings
Beekeeper-applied miticides and fungicides were the most prevalent chemical residues found across 132 colonies from 23 operations in Florida and California.
Imidacloprid, a neonicotinoid insecticide, contributed 99.9% of the overall hazard quotient despite insecticides being a minority of total detections.
Dying bees preserved from a subsample contained higher levels of acutely toxic compounds than whole-colony surveys detected, revealing a survivorship bias in standard monitoring methods.
chevron_right Technical Summary
A study of 132 declining commercial honeybee colonies found that pesticide residues applied by beekeepers themselves—especially miticides and fungicides—were the most common chemicals present, but a single insecticide (imidacloprid) dominated toxicity risk and was found at high levels in dying bees.
Abstract Preview
Following heightened colony losses, we screened 132 colonies from 23 commercial beekeeping operations in the states of Florida and California. We assessed chemical residues, finding beekeeper-appli...
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