I don't like the looks of that at all. I think you have a rather serious case of Phytophthora cactorum. Most cases begin on the leaf surface as black spots and move down toward the crown where they will girdle the plant and kill it. Your plant looks as if it is already near the crown so there may be little time to stop the progression. Remember that fungicides are protectants, not cures, so I agree with Elaine in that you should carefully cut and remove anything with the black fungas. I would then drench the plant with a systemic fungicide such as Subdue or Aliette. I've also had success with Bayleton. I think it is past what cinnamon can do. Above all, isolate the plant and sterilize any tool or pot that comes in contact with it.
Jim
