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Canker in Sweet Gum

How to identify and treat canker in Sweet Gum.

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Sweet Gum care requirements

water
Prefers consistently moist soil. Water regularly during establishment and drought periods. Once mature, it is fairly drought-tolerant but performs better with adequate moisture.
soil
Thrives in moist, well-draining, slightly acidic soil (pH 5.0–6.5). Tolerates a range of soil types but dislikes dry, shallow soils and limestone.
light
Full sun; requires 6–8 hours of direct sunlight daily for best color development and growth.
symptoms

Symptoms to look for in Sweet Gum

  • fiber_manual_recordSunken, discolored, or cracked lesions on bark, stems, or branches
  • fiber_manual_recordOozing sap or dark staining around the lesion
  • fiber_manual_recordDieback of the branch or stem beyond the canker site
help

Common causes in Sweet Gum

Canker is a general term for localized bark and wood lesions caused by various fungal pathogens (such as Nectria or Cytospora) or, less commonly, bacteria, which typically enter through wounds, pruning cuts, or frost damage, especially on stressed plants.

healing

How to treat canker in Sweet Gum

Prune out affected branches well below the canker margin, disinfecting tools between cuts, and improve overall plant vigor to help it resist further infection.

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Preventing canker in Sweet Gum

Avoid wounding bark, prune during dry weather, and keep plants well watered and fed to reduce stress that predisposes them to infection.

Canker in Sweet Gum — Symptoms & Treatment | GreenScout