Q.Lemon Tree
White spots on some leaves ( look like paint spots)

Downtoearthdigs
Answered on May 4, 2018
Sounds like scale insects.
Treat the leaves with Neem Oil.
These links will help you.
https://www.gardeningknowhow.com/edible/fruits/citrus/leaves-falling-off-citrus-tree.htm
https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm
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