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The leaves of my kaffir lime plant have the grainy discoloration which looks like a disease. I assume normal leaves would be plain dark green. I didn't see insects or aphids living or staying in the plant, just this discoloration. It receives direct sunlight around 10 am to 3 PM daily.

Can you help identify what caused this discoloration? Could it be caused by a fungus? What should I do to make it produce a healthy green color?

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It looks like a natural variegation. Mosaic virus has yellow blotches with vague edges. This looks to have sharp edges so not a problem.

https://en.wikipedia.org/wiki/Variegation

Yellow mostly between the veins can be bad (Citrus variegated chlorosis - a bacterial infection).

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  • Could this be nutrient deficiency?
    – akino
    Sep 11, 2020 at 5:31
  • Not to give a blotchy effect like this. Sep 11, 2020 at 6:45
  • It had dark green leaves when I bought the plant though.
    – akino
    Sep 11, 2020 at 7:01
  • To be really sure, do you have a photo on the most affected leaf? Sep 11, 2020 at 7:11

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