My large holly bush is covered with a black covering on all the leaves. Is this a "fungus" and is there a possibility of eliminating it, or must the bush be cut down?
Certified GKH Gardening Expert
This could be Sooty Mold, it is caused by pests on the plants.
Neem Oil can be used to treat the pests.
Please review the links below, as Holly can suffer other diseases that you can access the plants symptoms with.