I am a hobbyist beekeeper with 2 hives.
 
Today I observed 5 or 6 dead larvae on one of my hive entrance boards.
They are very clean and white, not "mummified" in any way. Could this
be Chalkbrood?
 
It has been very rainy and humid here in Michigan lately, which might
be resulting in poor hive ventilation. Am I correct in thinking this
is chalkbrood? What corrective measures might I take? The subject hive
is a very strong, populated hive, that has already produced a good
crop of light, spring honey. I'm also planning on harvesting some of
the darker goldenrod/aster honey. This flow is just starting in this area.
 
I leave 2 full-size hive bodies on for the winter, and these had a
good honey supply when the season started, even though we had a cold
winter. So I'm certain I will have a good winter food supply remaining
in the hive after fall harvest.