Why are the tips of the leaves on my avocado tree turning brown?

Question

Why are the tips of the leaves on my avocado tree turning brown?

Answer 1

This indicates a watering issue. Either the tree is not getting enough water or there is something affecting the roots that is preventing the roots from taking up water.

If your tree is potted, you should check for root rot:
https://www.gardeningknowhow.com/plant-problems/disease/treating-root-rot-gardening-tips-for-housplants.htm

If you don't find root rot, increase water to the tree.