What is a good product to use to control black soot on leaves?
Crepe Myrtle/Black Soot Control
Certified GKH Gardening Expert
We like neem oil. Not only will this take care of the fungus, but it will also eliminate the pests, most likely aphids, which are causing the issue. Here is more information: https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm