I have a suspect that I hope I'm wrong about. I have moved several of my hives to a more rural area,,,,,,,,farms,,,farmettes and the like. I don't find it unusual to see a quantity of dead bees in front of the hive this time of year. I did notice some have pollen still on their legs. Never noticed this at the previous location. Pears and cherries are starting to bloom, plus some ornamentals,,
Seems funny they got to the hive and didn't make it in to unload the pollen. Pesticide????? Not a lot of bees,,,,,,dozen or so,,,,but on more than one hive.