Black Knot Fungus: Why Dormant-Season Pruning Matters
/Black knot fungus is a common and serious disease affecting cherry and plum trees (Prunus species) throughout British Columbia. Caused by Apiosporina morbosa, it appears as hard, black, swollen growths on branches that restrict sap flow, weaken structure, and lead to progressive dieback if left untreated.
In our region, cool and wet spring conditions create ideal circumstances for the disease to spread—making early intervention and correct timing essential.
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