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Managing Severe Black Knot on Cherry Trees

Sanitation and Fungicides for a Widespread Disease

Black knot galls on cherry require aggressive pruning: cut 2–3 inches below galls in dormancy. On large limbs, chisel out knots plus 1 inch healthy bark, tapering cuts. Burn all prunings before spring. Fungicides (captan + benomyl) from early bloom to mid-June aid but don't replace sanitation. Remove nearby wild plums/cherries harboring disease.

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