My viburnum shrubs have a black-like soot covering all over its leaves. There are also some small, very small, white gnats or something that when you shake the bush start flying. First, what is the black and how do I tend to it? Then, what about these little bugs?
Certified GKH Gardening Expert
Here is an article or two that you may find helpful: https://www.gardeningknowhow.com/plant-problems/disease/how-to-get-rid-of-sooty-mold.htm