Where are the cell towers located vis-a-vis the crops and the hives? What frequencies are the cellphones -- analog or digital? How about the microwave links connecting the towers? It's not just one or two cellphones, it's a network and it's all over. I'll bet every farmer and beekeeper has a phone on all day. This hypothesis needs testing quickly to determine true impact of the network and if true, eliminate frequencies that interfere or move the towers away from the crops.