The biggest rumors I've heard (only rumors!) as to this was a notice
about genetically modified corn, or minor changes in earths magnetic
field (bees use it as a kind of GPS to find home in addition to the
orientation by sun). Might be there is a point.

There you go. The bees get disoriented, wander into hornet territory,
and become roadkill. Sounds simplistically funny but it might be just
that simple.