Symptoms/Identification White, Gray, and Black mummies in brood cells, at the entrances, and on bottom boards Often found after cool, damp weather How it Spreads Infected equipment Infected pollen Moving infected combs to uninfected hives Drifting/Robbing Treatment Feeding Sugar Syrup and Pollen Requeening Increasing ventilation (screened bottom boards) Moving colonies to sunny dry locations Replacing old and diseased comb Prevention To help prevent Chalk brood, always steril