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Omaha symptom guide

What Should I Notice at the Trunk Base, Roots, or Around Mushrooms?

A missing root flare, circling roots, base wounds, cavities, or fungal conks can point to root restriction or decay, but the amount of sound wood, hidden roots, and nearby targets change the safety question.

Sources checked: 2026-07-26Next source review due: 2027-01-26Independent professional review: not completed

What this page is for

Organize the observation before choosing action

Help homeowners document the base safely and recognize when a structural hazard screen should come before plant-health research.

This page does not identify the cause, recommend chemical treatment, or determine that pruning or removal is needed.

What to notice

  • Photograph where the trunk widens into roots, any circling roots, wounds, cavities, mushrooms, grade change, or soil piled against the trunk.
  • Record nearby construction, trenching, grade changes, irrigation, and whether the canopy decline is one-sided.

Plausible categories to compare

These are not ranked probabilities and do not form a diagnosis.

Planting depth or root restriction

Deep planting, compaction, and circling roots can interfere with root and trunk function.

Decay or old injury

Conks, cavities, and trunk injuries can accompany internal decay, but they do not alone measure remaining strength.

Site disturbance or moisture

Construction, root-zone disturbance, drainage, and irrigation history can help explain root and canopy changes.

What to document from the ground

  • whole tree and nearby targets
  • trunk base from several sides
  • root flare and soil grade
  • mushroom/cavity close-up without touching
  • construction and irrigation history

Safety boundary

Do not dig, cut roots, strike the trunk, enter a cavity, or stand beneath suspect limbs. New lean, lifting soil, a major split, or targets below requires Hazard first.

Use the Hazard Assessment

Related named references

These names are useful for further research, not confirmation of what is affecting a specific tree.

Girdling RootsVerticillium WiltDrought or Water Stress

Sources