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Plant Disease Clinic Highlights
This article was published originally on 4/27/1994Black Knot
Black knot occurs on cultivated and wild cherries and plum. The disease is caused by the fungus Apiosporina morbosa. Black knot is characterized by the presence of rough, warty black galls which may extend up the branch from a few inches to a foot or more. Fungal spores produced on year-old or older galls initiate infections on young, succulent twigs.
Sanitation measures usually control the disease adequately, but may be supplemented with a fungicide program if the disease is unusually difficult to control.
Year of Publication:
IC-467(9) -- April 27, 1994