Q.The Healthy Leaves On My Mulberry Are Disappearing Overnight Leaving My Trees Nearly Bare. We Do Not Have Any Deer Here So What Else
could be removing them? I find beautiful healthy leaves near the base of the tree. These trees are in pots, started last year. They did appear to be very healthy, no brown spots or insects that I can find. The leaves were being detached where the stem meets the branch, but now that most of the leaves are gone the branches are being cut. I keep them sprayed with a strong mixture of Neem oil but it doesn’t seem to make a difference. I keep them on a pallet around 4 feet off the ground. Could it be a bird?

Certified GKH Gardening Expert
Mulberry trees are deciduous, so the leaves dropping at this time of year is part of their normal process. They should begin to flourish again when spring comes and, unless you're seeing signs of insect infestation, mold or other problems, they will probably be fine.
https://www.gardeningknowhow.com/ornamental/trees/fruitless-mulberry/mulberry-tree-in-a-pot.htm
Here is info about deer, which you may have and not know it.
https://www.gardeningknowhow.com/plant-problems/pests/deer/newly-planted-trees-deer.htm
And borers:
https://www.gardeningknowhow.com/ornamental/trees/tgen/tree-borer-insects.htm