Unfortunately, this could happen for very many reasons. This can happen for just about any kind of stress to the tree, including pests, over and under-watering, too much ultraviolet light, and many more. Here is an article that will give you a better idea of what you are dealing with: https://www.gardeningknowhow.com/edible/fruits/avocado/avocado-pests-and-diseases.htm
Answered on October 18, 2018
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