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Chalkbrood is a fungal disease that affects the brood once they are sealed in the cells. Once they are dead, the larvae are chalky white and resemble mummies (kind of) that are spotted on the underside where the fungus discolors the corpse. These dead larvae are then drug out of the hive and deposited in the area in front of the landing board. It is then that you will notice the disease. These corpses will be hard and chalky rather than soft and squishy.

 No treatment is recommended as colonies can recover on their own. However, you can requeen to help break the brood cycle. Also, chalkbrood will typically infect one frame at a time; remove this frame, freeze it and scrape it clean. 

Keep your hives healthy with good ventilation.

Requeen every few years to keep a young vigorous queen laying good eggs in the hive.