Black Knot Disease
Submitted by Meghan Shinn on March 8, 2011 – 8:00 am
Question: Our purple-leaf plum tree has a couple branches with a thick black crust covering a section of bark. I think it is black knot. How should we treat black knot disease?
Answer: Black knot is a disease that attacks plum and cherry trees (Prunus spp.)—both ornamental types and those grown for their fruit. The disease is caused by a fungus called Apiosporina morsoba (syn. Dibotryon morborsum), which is native to North America. Cases have been reported in all U.S. regions where these trees grow (wild or cultivated), but historically it has been most prevalent in the Northeast.
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