What are key indicators of structural defects that may lead to failure?

• A. Codominant leaders with included bark, cracks, large deadwood, weak attachments, notable lean, or hollow trunk.
• B. A perfectly straight trunk with no defects.
• C. Small pruning scars only.
• D. Lush, evenly distributed canopy.

Answer: (A)

Structural defects that raise the risk of failure are signs that the tree’s wood and connections are weakened. The combination of codominant leaders with included bark, cracks, large deadwood, weak attachments, a noticeable lean, and a hollow trunk signals multiple failure modes: a split or weak union between leaders, vulnerable points where cracks can propagate, decay or hollow areas reducing strength, and gravitational and wind loads increasing the chance of breakage. Together they indicate a real safety hazard and a higher likelihood of sudden failure under stress.

A perfectly straight trunk with no defects suggests sound structure, not a risk. Small pruning scars are common and usually not a major defect unless they are extensive or poorly treated. A lush, evenly distributed canopy points to good vigor, not structural failure.