Black Film on Viburnum Leaves
I have a number of viburnum trees used as landscaping coverage. They are all about 4 years old and about 10 feet tall. All the leaves have a black film on them which will rub off if I try to do so (see image). We have not had rain in over a month (Montgomery County). Is there anything I can spray on the trees to remove the black film? Is this harming the trees? Should I be worried about it?
Thank you for the submission. The issue you are seeing is called black sooty mold.
Here is a link than will answer your questions. http://plantdiseasehandbook.tamu.edu/problems-treatments/problems-affecting-multiple-crops/sooty-mol...
If you need anything else please let us know.. Thank you again.