Canada cherry tree (chokeberry)
Black Knot is aptly named for the black knotty or corky growths that form on branches infected with this disease. It is a problem which may occur on American, Japanese or European varieties of cultivated plums and prunes; on cultivated sweet and sour cherries; on flowering Prunus species; and on wild plums and cherries. That being said, I have seen very few chokecherries (Prunus virginiana) with black knot brought into our office. Like all plants, of course, they are susceptible to disease and insect depredation. Selecting healthy plant material and the right plant for the right location can help you successfully landscape around your home.
The Amur chokecherry is less prune to disease problems and may appeal to you instead.
Feel free to contact our office if you have other questions.
Let me know if I can help you further!
Jefferson County Cooperative Extension Service
810 Barret Ave
Louisville KY 40204