Sue writes:

I'm not missing any of the females in my morning rounds. Do sometimes
the blossoms simply not open so can't be pollinated?

It's refered to as abortion when the plant drop unopened female flowers.
This can happen when the plant lacks the resources to develop fruit, for
example when its location is too shady or the plant is suffering from a heavy
pest load.

(This always happens on my winter squashes after they have set a 'full load'
of fruit.)
--
Pat in Plymouth MI ('someplace.net' is comcast)

Any technology distinguishable from magic is insufficiently advanced.
(attributed to Don Marti)