Q.Kumquat tree
I have a large kumquat tree that is probably 20 years old this year it looks like the leaves are thinning and maybe curling. Also looks like it has quit Bearing fruit

Downtoearthdigs
Answered on July 13, 2016
This can be caused by pests, environment or nutrition issues.
These articles will help you.
https://www.gardeningknowhow.com/edible/fruits/kumquat/growing-kumquat-trees.htm
https://www.gardeningknowhow.com/edible/fruits/citrus/curling-citrus-leaves.htm
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