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Plum Tree Base Bumps: Normal Callus or Canker?

3-year-old plum has 5 bumps on one side at base, one wrapping halfway with missing bark. Bumps have white/tan center lines. Tree otherwise healthy.

Diagnosis

Large bumps = woody callus tissue healing old injury (likely mechanical). Tiny "pimples" = lenticels (normal gas-exchange pores). Not a disease.

Advice

Keep mowers/trimmers away from trunk.
Monitor for wilting/yellowing – none now.
Tree should be fine.

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