Q.Citrus tree leaves
What causes our leaf to curl up? Some have brown on the underside of the leaf. Is this a mold?

Downtoearthdigs
Answered on January 22, 2017
Here is a link that will help you pinpoint the cause.
https://www.gardeningknowhow.com/edible/fruits/citrus/curling-citrus-leaves.htm
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