Treating Viburnum fungus - Ask Extension
What is the black fungus like substance on the stems & branches of a pink sensation viburnum? How to remediate?
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Treating Viburnum fungus #784459
Asked March 19, 2022, 12:50 PM EDT
What is the black fungus like substance on the stems & branches of a pink sensation viburnum? How to remediate?
Lane County Oregon
Expert Response
This could be caused by a few things, including Botryosphaeria, wood decay, or a type of root rot such as Phytophthora. Are there any other symptoms on the trunk or leaves? Do you see white mycelium, shelf fungi, or sunken lesions on the trunk? Is the bark falling off? Did you observe any leaf spots? Did you observe any wilting of leaves? When did you first notice the symptoms? A little more information would allow me to dig a bit deeper.