I found one of my hives queenless yesterday, no brood no eggs. So I introduced a frame with eggs from another hive. If they start building queen cells on that frame, that will confirm that the hive is queenless. If that is the case I plan to combine this hive with a nuc with a nice laying queen.
I have 2 questions on how to proceed:
1. When should I look for queen cells on the frame that I introduced yesterday?
2. If they start queen cells, do I have to destroy those before combining?
Thanks for your help.