Nope, I switched the colonies all to screened bottomboards last year. The chalkbrood issue still remained with this colony. The was the only colony out of 10 that has issues. The hives were all situated on a grassy knoll, sitting on bricks, sun from sunup to sundown. We live in a moist climate, yes, but this was just a non-resistant hive. Period. When I united it with another colony that chalkbrood disappeared and did not come back. The hive was so weakened by the loss of so many colony members, it was not very big when I united it eventually. I should have not been so neglectful about this chalkbrood issue. I just got busy and figured after requeening with a new purchased queen it would clear up. Never did.
Something I learned very recently and must be imparted. When chalkbrood is present in a colony, never allow the bees to raise a new queen from the larva from this hive, the genes of non-resistance to chalkbrood will be with the daughters of this colony and the chalkbrood disease issues may quite probably still remain. Breeding poor genetics. Bring new stock into this chalkbrood colony only.
I am referring to you KathyP when I said this previous sentence. You said that you allowed the chalkbrood colony to requeen itself. You say that it is doing OK. Hopefully next year the hive won't be weakened by low resistance to chalkbrood disease. Keep a close watch on this colony, girl. First sign of chalkbrood, "off with her head", like you said so many posts ago, and purchase a new queen, she will have offspring that should be resistant to this malade.
Spring is coming, quickly, we will all be busy and happy looking after our girls, and having fun, fun, fun!!!!! On to another year of bee worship and addiction!!!! Hee, hee. Have a wonderful and greatest of days, Cindi