Hi, I'm located in upstate NY in the Adirondacks. I keep Carniolans. This past summer my hive swarmed and I captured the bees that split. This past week I noticed that they were hauling out a large number of larvae that were still alive. No mites or diseases that I could see, and no invaders. Yesterday they swarmed right from the hive leaving it barren. When they initially swarmed it was preceeded by a lot of wet weather and I think they just struggled to put up enough honey. Not a lot of fields and blooms here.
I'm guessing they pulled the brood because they were cutting losses knowing their stores weren't enough.
The original hive looks good though- they seem to be stronger and have made some honey and I'm feeding them 2:1. I just noticed though that they're pulling some brood as well in all stages or development, though not nearly as many. Again, no mites or disease that's immediately apparent.
Is it safe to assume that so long as they're not making the same size sacrifice as the smaller swarmed-off hive that they're feeling the oncoming cold weather (some nights already dipping to the upper 30's) and preparing for winter?