Brown spots on Calamondin Juvenile

[Jotoqi]

Early last spring during a flower show, I purchased this juvenile Calamondin Orange Tree. It was in great shape, and it had started to bloom. All was well until maybe early May, when brown spots started to develop on the foliage. I percieved this as sunburn since I had left the tree on the sunniest side of my house, so I moved it into the shade.

This seemed to just worsen the problem. The browning spread to other leaves and scarred the fruit, and small holes started to appear in the browned foliage. Before the problem worsened, I transplanted the tree to a bigger pot, so that might have pissed it off.

Does anybody know what this is? Could it be mites, fungus, disease, over/under watering, or simply a bad reaction to the change of position? 

[Jotoqi]

I will take another picture tommorow. This one was taken at night.

[Howeadypsis]

Sounds like a root problem, possibly overwatering. Number one killer of plants. 

[Rose]

Citrus is a nightmare. They either thrive or die. Looks like one of the many diseases of citrus, fungal, bacterial or pest. From what I can see it looks like  bacterial or fungal. There are many sites with graphic illustrations of citrus diseases.......... http://ipm.ucanr.edu/PMG/C107/m107bpleaftwigdis.html

At the moment my lemons are turning dark dark black green instead of ripening then they split. Who knows. Next year I will start with the watering, fert and trace elements before the flowers arrive.  See if that helps. I think its just been too hot.

Edited June 7, 2018 by Rose