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.