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In the picture you can see brown dots on my indoor citrus tree. I have the citrus tree right next to a window. I also have 3 small citrus trees like this, but only this one has brown dots. I treat them all the same way.
I can remove these dots by hand.
How should I cure citrus leaves?
This question appears to be about the same plant as in your other one - if you have an infestation of insects (scale in particular) then grazing damage will occur on the leaves. I refer you to the answer given under the other question.
