Q.lemon tree
What causes the leaves to get white stuff on them and curl up and what can you do about it?
Downtoearthdigs
Answered on June 19, 2016
This is a pest issue.
The links below will help you.
https://www.gardeningknowhow.com/edible/fruits/citrus/curling-citrus-leaves.htm
https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm
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