I'd pull the bad frames and get some XenTari BT to treat. Might help..?
I put a whole new hive there and swept the bees into it. Then put a frame of brood from the strong hive. I don't know if I will save them or not, at this point. It was infested bad in a short time. Put up a moth trap, and burning a citronella candle away from the hives at night to try to lure the moths away from the area. I put all of the wax out of the old hive into a pan and heated it to kill the larva. So much crap, I can't even save the wax. I also narrowed the hive entrance. Studying about how to make sure the strong hive does not go down. miles
