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The leaves of the tree or shrub are being filled with white spots?If so, it is a disease called powdery mildew, caused by a fungus.
Can you observe hollow spaces in the leaves of your citric tree?
The dollar spot is a disease caused by the fungus Sclerotinia homeocarpa.
Do the leaves of the plant turn to a yellowish colour and the nerves of the leaves become intensely green?
If you see black insects all along the trunk of the tree or conifer.