Does the fruit have the calyx like a persimon? As Gene said, persimmons are
misty blue, just like a blueberry, before they begin to ripen. The fruit on
the ground isn't necessarily ripe fruit, the tree prunes its fruit all sesson
and drops off fruit at all stages.
Are you sure it's not a persimmon because of its bark and foliage?
"Racoon up in a 'simmon tree
'Possum on the ground
'Possum says, "You son of a gun,
Throw some 'simmons down!" </HTML>