| Check the underside of the leaves for common tea scale (see attached link). Just as Jeff said, they excrete copious amounts of a sugary substance (plant sugars) that this simple black mold can grow on. It is not a disease. You must control the tea scale for the black sooty mold to disappear. Check for the insects under the leaf, but if the infestation is bad you can see a mottling on the upper surface from all the damage the insects do. |
Here is a link that might be useful: Camellia tea scale
