Wood that is visibly decayed, greatly weakened, and soft is in which advanced decay stage?

• A. Rot
• B. Decay
• C. Deterioration
• D. Collapse

Answer: (A)

Rot is the name for advanced fungal decay where wood is visibly decayed, greatly weakened, and soft. Fungi break down the fiber and structure of the wood, leaving it spongy, crumbly, and unable to bear loads. This level of deterioration is a clear red flag that the wood’s strength is compromised and it should not be used for climbing anchors or support; it should be replaced or removed.

The other terms are broader or refer to different outcomes. Decay and deterioration describe general deterioration, not the specific advanced, soft, weakened stage. Collapse means the wood has failed or broken apart, which is more extreme than the description given.