brown spots on the leaves of my fruitless mulberry
The leaves get brown spots on them, then the leaves turn yellow and fall off. I live in Texas and we have had record rain fall this spring.
The heavy rainfall may be the cause.
A well established, healthy tree should be able to withstand the flooding rains.
I would watch the tree for any additional signs of disease or insect infestations.
I do think your tree will recover.
Here are a few articles for things to watch for.