Regarding requeening to help with chalkbrood, this is something that is
often recommended as an aid to getting past a stress disease. I
subscribe to the theory myself. It is not the new queen, per se, but the
break in the brood cycle that usually accompanies requeening. There
willbe a period of lower egg laying while the new queen comes up to
speed, leading to fewer larvae for the nurse bees to tend for a while.
This gives more time for house chores such as cell cleaning, and disease
organisms are more efficiently cleaned out.
 
Dick Bonney
[log in to unmask]