Q.black leaves on large established gardenia
What is this and can I correct it?

Downtoearthdigs
Answered on November 17, 2016
This is likely Sooty Mold.
https://www.gardeningknowhow.com/plant-problems/disease/how-to-get-rid-of-sooty-mold.htm
Generally Neem Oil will treat the insects responsible for this.
https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm
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