Tagging onto an old thread for opinions. Due to 2 bereavements this year necessitating many extended trips, I wasn't able to look after the hives as well as I would wish.
Of 2 that swarmed, they requeened and there was BIAS at one point. Both on brood and a half.
Now they are declining, egg laying is over (north Scotland). Today's inspection revealed chalkbrood in both. Mummies on the floor, etc. I could give you a long list of things that could have brought it on. My interest is in recovery. I am going to burn the brood frames. They are all ancient, black and nothing worth saving in them. Both brood supers are full of stores. Both humming contentedly to suggest a queen present. I put pollen patties on, mainly to make me feel better.
Two possibilities for recovery - which?
1) Unite both supers with bees on top of an empty brood box
2) Unite both supers straight on to the mesh floor. I'm thinking this would be cold though.
I plan to let the queens sort it out, doesn't matter as neither are fit for purpose. As I understand, CB is highly genetic.
Thanks for advice. Not a great start to winter. A 3rd hive is already gone, never saw chalkbrood but I think the queen wasn't well mated.