As Bob has said, once robbers take honey back to their hive, more and more
robbers will come. You may not have the option to move the hive out of 
range.  What about
simply trapping the robbers? A box in front of the hive, baited with a comb,
with a bees escape valve fitted in the entrance. Shut the hive itself when
all its bees are back - and feed if the queen is still alive as its stores 
will have gone. A screen board
on the extra box would let you kill the trapped robbers each evening by 
sprinkling
in water with detergent, with no robber escaping.  Once honey
stops going back, so will recruitment of new robbers.

Robin

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