Auntie Bee and Uncle Drone answer a query about suddenly finding many bees dead in front of a hive

Hi Auntie Bee and Uncle Drone,
I found a heap (hundreds rather than thousands) of dead and dying bees in front of a hive this morning. A couple of days ago a lot of yellow lumps of pollen had appeared under the hive. Have had a closer look and most of the dead have furry bodies, probosces sticking out, folded legs and wings at more or less right angle to bodies. Recent Varroa count negligible. The hive seems to be thriving otherwise. Could be garden pesticide?

From Uncle Drone: Any situation where there is a sudden increase in dead bees in front of the hive should ring alarm bells as the most probable cause is a pesticide or herbicide being used wrongly and not according to the licensed method. Either a plant has been sprayed with a pesticide to kill greenfly or maybe some grass that has clover in it has been sprayed with a herbicide to remove weeds other than grass such as clover and dandelions.

From Auntie Bee: I agree with Uncle Drone this does sound like poisoning.  Were all hives in the apiary affected or just one?
The only other situation I have encountered where there are many dead bees at the entrance is when a colony of mine was affected by Chronic Bee Paralysis Virus but this is easily recognised as there will be adult bees inside the hive showing symptoms, bald and shiny, trembling and walking aimlessly, often on the top bars.  I killed the queen in my infected hive and united with a newly mated queen in a nuc.  Within three weeks the hive had recovered, although all the old bees were then found dead in front of the hive.
The only thing to add is to make sure you sterilise your hive tool between hives ( which you should be doing anyway) to ensure that if there is disease present it doesn’t spread.
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