This was reported in Scientii=fic American awhile back. Honey farmers are having to load up their hives and truck them around the country so that Apples in Washington State, fruits and vegatables in the Imperial Valley of California and
ALL crops that require pollination are pollinated.
As Rush would say, "This is series!"
I have friends who had a bee business in Washington State in the 1980's, and possibly still do. They moved hives of bees from orchard to orchard during apple blossom season. They were hired by the orchardists who wanted to have a better crop, and they sold the most amazing delicate apple blossom honey. This wasn't because of any kind of mite. Just good orchard practice.
My husband and I bought an apple Orchard in California's San Bernardino mountains. It is about at the 6000 foot level. Our orchard is just coming into bloom so we just took two colonies up there.
Our problem hasn't been mites (yet, thank God!). It has been bears. They tear up a hive and kill the bees.