I admit I am about 70% accurate on whether a hive is queenless or not. My overwintered Nuc came out strong in March. I saw the queen 3 weeks ago. Havenít seen her nor eggs, larvae for the last week. Trying to let the bees figure it out. Added brood + eggs to see if they will make a new one + surpress any laying workers. 4 days later still nothing. Added a frame of brood today with a queen cell and larvae from another colony.
If they donít accept that not sure what to do. I hesitate to add a queen if they are not making one themselves but they canít continue without making more bees.