I have a hive with chalk brood. I changed out the bottom board to a SBB and left the entrance wide open.(I had it reduced due to dearth and robbing,,,fall flow is just starting so robbing shouldn't be an issue))I also use a inner cover that has wood shavings with screened holes and vents in the side. A site I visited stated to destroy the infected combs. Is that the consensus amongst the experienced in this group.?