Avocado tree stems turning black and leaves with brown spots

So we bought an avocado tree a few years ago (I believe a Hass avocado tree but cant remember). I was very busy at the time and kind of neglected it in a pot outside. Every once in a while it would get watered but for the most part it was left to the environment. Well now I am getting back into gardening and have started taking care of it. It has a few leaves, most of them with brown spots and are wilted. The stems look like are turning black. There is some new growth with fresh leaves I can see, and for the first time, little avocados! I would love to save this tree but need to figure out what plagues it first! Please see the below pictures. I live in central florida and the tree gets about 6 hrs of sunlight a day. Now that the summer is here for the past few weeks I have been making sure to water it about 3 times a week. It is still in a a large pot (with good drainage), and I know I should plant it in the ground but we plan on re-landscaping soon and would rather keep it in the pot for now. Though I do plan on transferring it to a larger garbage can sized pot. So the question is, what ails it and how can I fix it?! It seems to have withstand whatever it is for the past few years.

Thanks!

Thumbnail by sunlightsolace Thumbnail by sunlightsolace Thumbnail by sunlightsolace Thumbnail by sunlightsolace
Hadley, PA(Zone 5a)

It looks as if there is some sooty mold on the plant, which could mean that there also may be some insects such as scale on there. You can read details at the following link:
http://www.ipm.ucdavis.edu/PMG/r8101411.html

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