maybe the brood break over the winter gave them the time to groom them out. or they are good genetically and the mites last fall were drift..you can call me Leroy.
Re requeening, confused and a bit dazed. Don't know
I haven't seen any evidence of alternative explanations, but that doesn't mean they don't happen. Between last fall and spring not much chance of any of those scenarios working out. I'm sure they have mites, that it is in the drone brood, but it seems likely that they did a pretty good job of murdering mites during the winter. It isn't being overwhelmed with them at present. I have the inspector coming by in two days and she is going to do a number of sugar shakes. Maybe I'll take a few brood samples for comparison.maybe the brood break over the winter gave them the time to groom them out. or they are good genetically and the mites last fall were drift..
I would be confused as well. Any chance they re-queened, either a small swarm joining or superseded on their own? Just when you think you can predict...Thank for sharing.
Leroy:I have more questions than answers...