Fruitless Mulberry

Question

The leaves are curled in around the edges and are lighter on the edges.

Answer 1

This could be watering issues, the tree may need more moisture.
Lack of nutrition is a possible cause along with disease or pests.
Here are some links to help you further pinpoint the cause.

https://www.gardeningknowhow.com/ornamental/trees/fruitless-mulberry/fruitless-mulberry-trees.htm

https://www.gardeningknowhow.com/ornamental/trees/fruitless-mulberry/possible-causes-of-a-fruitless-mulberry-with-yellow-leaves.htm