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Plum/Cherry Black Knot: Prune Out Knots in Winter, Few Fungicides Work

Hard black crusts on limbs = black knot. Common on plums/peaches in GA.

Control

Prune 3–4 inches below knots during dormancy (before April 1).
Few fungicides effective—check labels.

About Gardening: Black Knot Disease on Flowering Plum: Pruning and Prevention; Black Knot on Plum Tree: Prune, Sanitize, Fungicide for Prevention; Plum Tree with Jelly-Like Sap: Borer Infestation; Black Knot on Plum: A Serious Fungal Disease; Managing Black Knot on Cherry Trees; Flowering Plum Black Knot: Identification and Control; Black Knot on Plum Trees: Fruit Safety and Disease Management; Oak Twig Galls: Identification and Management; Black Knot Disease on Plum Tree: Fruit Impact and Control; Black Knot Disease on Stone Fruit Trees: Pruning Out Infected Limbs

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