Looks a lot like Melanose. Is this condition on other fruits in area? If so it is a fungus disease. It can be treated by applying a good fungicide (I recommed Copper applied at temps around 75 degrees. Melanose needs dead wood/twigs to complete its cycle. Keep it removed and dispose of it by burning. It appears that whatever you have it is pretty advanced. Have you checked for mites? Sometimes mites will do damage such as you have. Look closely and see if this could be a factor.