Q.Young Avocado Tree
I have a young avocado tree and the leaves have fallen off and the limbs are turning black. Is there anything I can do to save the tree from dying?

Certified GKH Gardening Expert
This could be sooty mold. It happens when the plant gets a pest infestation. I would recommend using neem oil, as this will get rid of the sooty mold fungus and kill the pests. Here is some articles that will help you:
https://www.gardeningknowhow.com/plant-problems/disease/how-to-get-rid-of-sooty-mold.htm
https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm