Robbing is a syndrome that requires a break point as intervention.  I 
agree with all that has been said.  I would add that in hive feeders go a 
long way in preventing robbing but you will still see some rich taking 
from the poor.  I have fed 2-3 gallons to a not necessarily weak or 
queenless hive and found them not much heavier than when started.  

The only other suggestion is something you specifically mentioned was not 
a preferred option and that is a move.  Perhaps you could do a bit of 
moving about within your apiary.  This could be swapping strong with weak 
or outright moving the strong ones to a new spot (they will find a home if 
hives are in the near proximity).  This goes against everything taught 
about moving bees a certain distance but a mixup is just like a move in 
causing the bees to reorient.  

But, with this the source from which they were robbing must be secured 
(covered in previous post).  The move is the stop gap for the syndrome.

Bob Nelson
Norfolk, NE

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