My Camellia plant's leaves are covered in a black substance. It can be washed off, so it isn't in the leaves but on the top. I have tried spraying for fungus but it doesn't seem to have made any difference. The bush is about 8 ft high and 4 ft wide, has been beautiful up to now. Help.
Certified GKH Gardening Expert
This is sooty mold. This article will help you: https://www.gardeningknowhow.com/plant-problems/disease/how-to-get-rid-of-sooty-mold.htm