High temporal resolution pollen analysis: New insights into current-use pesticides distribution in agricultural landscapes.
Cirelli S, Kast C, Fracheboud M, Droz B, Hornak K
Pollinators
The wildflowers you're encouraging along your fence line or garden edge may already be carrying pesticide residues drifting in from neighboring farms — residues that arrive on bee legs long after the last spray date has passed.
Scientists collected pollen from beehives every week for two full growing seasons near intensively farmed fields. They sorted the pollen by plant type and found pesticides not just in crops that were sprayed, but also in pollen from wild plants that nobody ever treated directly. Some of these chemicals hung around for weeks — one insecticide was still showing up in pollen long after farmers had finished applying it.
Key Findings
Pesticide residues were detected in pollen from untreated wildflowers near crop fields, confirming meaningful off-target drift beyond spray zones
The neonicotinoid insecticide acetamiprid persisted in pollen for weeks after the application period ended
The fungicide cyprodinil reached concentrations as high as 1,025 μg/kg in pollen samples collected from the study colonies
chevron_right Technical Summary
Pesticides applied to farm crops don't stay where they're put — they drift into nearby wildflowers and linger in pollen for weeks after application ends, exposing bees to a broader chemical cocktail than anyone intended. Weekly pollen analysis from five beehives over two growing seasons confirmed this contamination is widespread, persistent, and tied to specific crop-spraying events.
Abstract Preview
Current-use pesticides (CUPs) disperse beyond treated areas, leading to unintended exposure of pollinators and other non-target organisms. Although this issue has received increasing attention, und...
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