Recently added item(s)
You have no items in your shopping cart.
Personalize your experience with Penn State Extension. Subscribe today!
Save For Later Print
The disease is very destructive, killing twigs and limbs, and occasionally whole trees. Although there are no cherry varieties that are reliably resistant to black knot, there are some plums with resistance.
The spores of this fungus are spread by wind and rain to the young twigs in the spring. After infection, a light brown swelling develops late the same year or the following spring. During the following growing season, spores are produced on the olive-green surface of the gall. Wild plums and cherries are important sites where the fungus persists in the landscape.
Prepared by Gary W. Moorman, Professor of Plant Pathology
Thank you for your submission!