Botanic Garden >> Gardening > >> Question and Answer >> Plant Diseases

Crabapple Trunk Galls: Adventitious Roots, Not Disease

Swollen Trunk Areas Worry Owner

Galls along trunk; owner fears for tree shading patio.

Expert Reassurance

Not black knot. Swellings likely adventitious roots. Avoid trunk wounds (mowers, trimmers). Water and fertilize appropriately. Tree should live many years.

Follow-Up

Owner relieved; expert enjoys positive feedback.

Plant Diseases: Ash Tree Marginal Scorch: Root Stress, Not Disease; Diagnosing Lilac Decline: Root Rot and Herbicide Injury; Black Knot Disease on Prunus (Plum/Cherry): Hard Black Galls on Branches—Prune or Remove Tree; Saving a Dying Palm Tree: Identifying and Treating Trunk Rot; Plum Tree Leaf Curl and Eggs: Beneficial vs. Pest Identification; Oakleaf Holly "Dirt Clumps": Harmless Spider Egg Sacs; Mysterious White Patches on Lemon Tree Bark: Fungus, Canker, or Something Else?; Woolly Apple Aphids on Crabapple: Lady Beetles vs. Spraying; Cottony Aphids on Young Sargent Crabapple: Identification and Control; Saving Heritage Crabapple Trees: Suckers vs. Cuttings

Garden Articles

Diagnosing Browning Leaves on a Japanese Dwarf Red Maple

Tulip Tree Troubles: Sapsucker Damage and Basal Decay

Crabapple Sparse Blooms and Bark Craters: Atomic Grow for Insect Cleanup and Vigor

Pecan Tree Nut Problems: Weevils, Scab, and Spray Schedule

Persistent Scale on Vines: Systemic Imidacloprid Solution

Kwanzan Cherry Oozing Sap: Bacterial Canker or Mechanical Injury?

Identifying and Treating Palm Rust Fungus

Plants

Powdery Mildew on Gardenia & Plumeria: Diagnosis & Treatment

Cut Blue Spruce Used as Christmas Tree: Cannot Be Replanted

Tree Removal: Chemical vs. Mechanical Stump Treatment

Replacing a Birch Tree with an Autumn Blaze Maple: Stump Considerations

Planting Apple Trees in Quebec: Buying vs. Growing from Seed

Pruning and Fruiting a Potted Lemon Tree

Avocado Pollination Distance: How Close Is Close Enough?