> I read the following method:
>
> - 2 hives
> - take from each hive a frame with brood in all stadia
> - exchange them
> - wait 10 min.
> - on those frame the queen can be found (she is looking for her rival)
 
After reading that here last year, we tried it on about twenty-five hives
and found it did not work at all for us.
 
Allen