This may be a bit early for a question like this, but JIC...

My wife & I live on the border of Zones 6 and 7 and have a small Fuyu
Persimmon tree. We planted the sapling about 11-12 years ago.

In the past 9 years the tree has put forth a number of blossoms that
have grown into small fruits. However, long before the fruit ripens,
most of it drops from the tree. In six of those years all of the fruit
dropped; in the other three years, most of it dropped. What is most
discouraging is that the year where we had the most fruit remain on the
tree was 1997, where it produced a couple dozen ripe persimmons. Since
then we've only had one year with fruit reaching full ripeness, and even
then only about half a dozen persimmons made it.

What are some of the things that can causes fruit for this type of
persimmon to drop?