Certified GKH Gardening Expert
This seems to be a fungal issue. there are a few things that I recommend for fungal infections. First, you will want to prime the ground with dolomitic lime, then spread wettable sulfur to Kill off any infection in the soil. I Also like to spray the plant itself. Mix a few drops of one or more of these ingredients into warm water with a spoonful of coconut oil: Rosemary oil, lavender oil, neem oil, garlic oil, cinnamon extract/oil and for really bad cases, also add clove oil. This will kill off any infection on the plant itself.