True chalk brood is caused by a fungus infection. In other words, mold. You can help the bees clear it up by treating or feeding ingredients that have anti-fungal properties. For example; thymol based products as well as some other similar naturally occurring substances. Propolis specifically is an essential component of a beehive that the bees use for controlling microbes and fungi. Clean up what you need to but try to avoid scraping everything perfectly clean. As beekeepers we are not big fans of sticky propolis glueing everything together, however have you not noticed that the hives that have more of it tend to be the healthier colonies? There is a microscopic level reason for that.
As for off the shelf options. Whatever is in honey bee healthy seems to work. My experience is HBH is helpful with chalk brood. I add it to pollen supplement feed patties. A bit of bleach in the spring sugar syrup feed helps as well. In severe cases, a hive so messed up with mummies that it is considered a lost causs, I have taken the hive completely apart and sprayed every frame, every box wall, every bee with a squirt bottle of a warm mix of HBH, smidgen of bleach, and sugar water. 2weeks later the hive is clean and unrecognizable as having had a problem. For a use of thymol to help, just cycle in an approved thymol based mite treatment into your IPM plan. Youll kill some mites and clean up the microbes at the same time.
Those are just a few ideas there for your to consideration.
Now, I did say True chalk brood. There are other pests and diseases that can cause tossed mummies, that are not the same fungus/mold category. Personally, I think there is a lot of room for expanding research into this area and improving beekeepers understanding of chalk brood symptoms. I see and hear many say chalk brood this, chalk brood that, when a lot of times the experienced beekeepers are saying it is not chalk brood but some other causal factor that are not yet fully known or understood. Any aspiring phd students out there looking for something other than mites to study? Consider this as an area of opportunity to make a significant academic contribution to the beekeeping community.
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