Calamondin-odd brown stripes on leaves

[thewallace]

I have a 30 year old Calamondin with an affliction I cant diagnose. I keep it in a ceramic pot and being I'm in New England I keep inside in the Winter and move it outside in the late Spring.

For the last two years each Spring, many leaves will get a brown stain which oddly will usually only show on one side (see attachment). It doesn't scratch off, its internal to the leaf. When it did this last year I repotted it in a new container with new soil and changed fertilizer. But the same brown stain appeared again this Spring. Has anyone seen this before?  Some mineral deficiency?   

[Vlad]

Please post a photo of a leaf. Sounds like it might be sun scald but I need to see an aflicted leaf to be sure.

[thewallace]

Oops, attached the wrong photo. Heres a close up.

[Millet]

The damage on the leaves shown in the photos are all on the same side of the leaf.  Therefore, the damage must be from sunburn