No Plums On Shiro Plum Tree

Question

My Shiro plum tree had so many blooms and it had a bunch of tiny little plums. Then right after we saw all of the new little plums, all of a sudden there were no plums at all, they just disappeared. How can that happen and what causes it? It is very humid here and we are suffering a drought, but we also have drip irrigation on our trees.

Answer 1

Here are a couple of articles that should help:
https://www.gardeningknowhow.com/edible/fruits/fegen/june-drop-information.htm
https://www.gardeningknowhow.com/edible/fruits/plum/plum-curculio.htm