Identifying Citrus Disease

Hi everyone.

I caught these black patches on the leaves of a few clementine trees. I don’t know much about plants and couldn’t find a similar photo when I searched online for “citrus diseases”. Does this look familiar to anyone here?

Thanks a lot in advance for your time.

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Probably greasy spot. See here: HS-1016/HS263: Field Identification and Management of Greasy Spot Disease

Thank you so much.