Great to see! I knew about some reasons. I think last year there was a pesticide that was linked to it. I forget the name, but there was supposed to be a benign component, but mixed with the pesticides it made it harmful to the bees and helped to foster the problem of colony collapse.
Neonicontinoid insecticides. The seeds of crops are coated with that stuff and it is believed that the pollen from the plants express that insecticide and kill bees. I don't know that much about it, but everyone has an opinion and an agenda.