re: UPDATED PICS - HELP - Problem with 1 of my trees.... Whats wrong?

My MIL had some tree problems with some satsumas that they had planted a couple of years ago. She got the name of someone (don't know if he is an arborist or not)but he came out and made a plan for each tree and she choose to have him do all the work for a couple of hundred. All needed fertilizing, some needed bug treatment, others needed a fungicide, etc. He charge a couple of hundred for all the work on multiple small trees...