Mandarin orange tree

What is causing the underside of my mandarin orange tree leaves to go brown? And what is the cure.

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1 Comment To "Mandarin orange tree"

#1 Comment By Downtoearthdigs On 01/30/2019 @ 7:44 am

My best guess here would be sodium toxicity. This is due to salty soil. This website will help you identify the problem further: http://ipm.ucanr.edu/PMG/C107/m107bpleaftwigdis.html ^[1]

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[1] http://ipm.ucanr.edu/PMG/C107/m107bpleaftwigdis.html: http://ipm.ucanr.edu/PMG/C107/m107bpleaftwigdis.html

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