> Some folks claim requeening a hive can have a very nearly immediate effect which would be unrelated to the workers that she would eventually produce (replacing a colonies workers with her daughters would take months). 

I have seen this many times, but one particular instance stays in my mind.  We were re-queening a particularly vicious colony some years ago - the sort where you pray that you will find the queen quickly!  I found the queen, killed her and threw her into the undergrowth.  Within seconds - before the new queen was introduced -  the colony became quiet and docile; it was most uncanny.  I put in the new queen which was accepted and we had no more bad temper.

Best wishes

Peter 
52°14'44.44"N, 1°50'35"W

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