> What are your first-hand experiences with deploying solitary bees for
> pollination, if any?

Alfalfa leafcutter bees are used on Prince Edward Island for blueberry
pollination, and they were also used in past years for hybrid canola
seed production.  They are a commercially deployable solitary bee.
You buy a tray of frozen cocoons and thaw them out a certain number of
days before pollination.

Although they are "sociable" in that they will nest by the hundreds in
a single hanging block of wood with holes, they are not "social bees",
but solitary by the definitions I have seen of social bees.  Each
leafcutter bee provisions only its own brood.  Because they do not
give up reproduction to a queen they are not social bees.

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