A good way to help make parasite harboring bee hotels safer for bee larva/pupae: paper or cardboard tubes that can be removed at the end of the season for storage over winter. Removal of tubes over winter protects against parasite damage.
Masonry Bees that are so integral to our ecosystem. Unlike honeybees or bumble bees, the Masonry Bee is a solitary bee. It has no queen or worker bees. They don’t produce honey or beeswax. Other than mating, their soul purpose is to pollinate.