Re: How do I deal with honey robbing from 'foreign' bees?
Hives severely weakened by mites become targets from robbers in fall, and of course the robbers get the mites in turn.
If the robbing is really bad, late evening, open the hive and remove all combs the bees cannot cover, leave just enough frames for the bees to cover them totally even if a super is 1/2 empty. So the bees are really crowded on the combs and can defend them, remove nearly all honey. Reduce the entrance to one bee, and have the entrance right where the main bee cluster is so bees can easily defend it. Don't have a top entrance, only a bottom entrance. A top entrance goes straight to where the honey is and where the least guard bees are, not good if robbing is happening.
Allow attempts to rob to subside over the next day or two then open the entrance slightly. Late evening open the hive and give a comb with a little honey so bees won't starve but make sure bees can cover the comb. Once you are sure robbing has stopped slowly return the inside of the hive to normal, always working late evening so robbers can't get started while the hive is disturbed.
If the above does not work the situation is likely hopeless and the only way to save the hive is to move it.
44 years, been commercial, outfits up to 4000 hives, now 120 hives and 200 nucs as a hobby, selling bees. T (mostly).