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Plum Tree with Raised Bark: Black Knot Disease

Rough Black Swellings on Plum Branches? Black Knot

Prune 2–3 inches below galls during dormancy. Burn prunings. Fungicides (Benlate + Captan) at early bloom to mid-June. Remove nearby wild Prunus. Sanitation is critical.

Plant Diseases: Plum Tree Shot Hole and Bark Bumps: Separating Insect Damage from Normal Lenticels; Pine Tree Yellowing Needles and White Sudsy Substance: Insect Identification; Plum Tree Leaf Curl and Eggs: Beneficial vs. Pest Identification; Gummosis on Ornamental Plum: Insect Wounds and Sap Flow; Plum Tree Sap Flow and Dieback: Signs of Borers; Plum Tree Loose Bark with Magenta Spores: Complex Diagnosis Needed; Frothy Flux on Weeping Willow: Manage, Don't Panic; Plum Tree Soft Bark Bumps: Scale Insect Infestation; Plum Pocket Disease: Remove Fruit, Fungicide Next Year; Plum Tree Leaf Spot and Fruit Drop in New Zealand

Garden Articles

Black Knot on Plum Tree: Prune, Sanitize, Fungicide for Prevention

Japanese Plum Tree with Borer Holes: Insecticide or Organic Option?

Victoria Plum Tree Disease: Identifying and Managing Common Problems

Flowering Plum Black Knot: Identification and Control

Controlling Peach Leaf Curl on Victoria Plum Trees

Sawdust Threads on Oak Tree: Wood Borers or Caterpillar Frass—Diagnosis Steps

Plum Tree Pruning for Fruit Production

Plants

Ash/Hickory Leaf Spot: Fungal Disease Management and Tree Identification

Ash Tree Marginal Scorch: Root Stress, Not Disease

Diagnosing Lilac Decline: Root Rot and Herbicide Injury

Saving a Dying Palm Tree: Identifying and Treating Trunk Rot

Dealing with Borers in Plum Trees: Identification and Treatment

Plum Tree Base Bumps: Normal Callus or Canker?

Ornamental Plum Delayed Leaf-Out: Environmental Stress vs. Fatal Decline