This bee (and others) is probably a victim of technology.  Note that it has disappeared from "large scale farming areas".  In the past, farmers had fence rows to show them where their property ended.  The fence rows contained long strips of weedy looking flowers  (just the kind that bees like because those weedy flowers are an abundant source of nectar and pollen which feeds the bees).  Now the farmers use GPS (global positioning system) to tell them where their property ends.  So the farmers ripped out the fences and the weedy flowers and grow crops on every inch  (metric equivalent is two and a half centimeters) of their property.  Crops are generally grasses like corn and wheat, which contain no food value for bees.  The fence rows also provided an area where the bees could build their nests, which would be left undisturbed by farm machinery (bumble bees build "nests").   Added together, the fence rows contained quite a lot of land that would need to be restored to rebuild habitat.