When foragers suddenly pile up dead or paralysed at the hive entrance after nearby spraying, the first hours determine whether the cause can ever be proven. This scene models a treated field beside an apiary: wind carries a spray-drift plume toward the hives, and the resulting die-off and forensic evidence both change with distance, wind, and elapsed time — the same factors a beekeeper or bee inspector weighs before reporting to the UK Wildlife Incident Investigation Scheme (WIIS).
UK guidance recommends collecting at least 200 dead or dying bees plus samples of suspect foliage and any nearby water as soon as poisoning is suspected, then reporting immediately through WIIS — freezing samples if a lab cannot receive them the same day, since many pesticide residues break down within 24–72 hours.
A treated field sits beside an apiary: wind carries a spray-drift plume toward the hives, dead bees pile up at the entrance, and the forensic evidence window closes hour by hour as you decide when to report to WIIS.
Exposure risk depends on wind speed, how directly the wind blows from field to hives, and the apiary's buffer distance. Colony die-off follows a saturating mortality curve over time, while sample freshness for lab testing decays on its own, faster clock.
Adjust wind speed and bearing, the apiary's distance from the field edge, and hours since the suspected spray. Watch the drift plume, the dead-bee pile at each hive, and the WIIS reporting status respond live.
UK guidance recommends collecting at least 200 dead or dying bees plus foliage and water samples as soon as poisoning is suspected — many pesticide residues become undetectable within 24–72 hours, so speed matters as much as coverage.