Crown vigor rating rubric.
| Class | Rubric |
|---|---|
| 1. | Tree appears to be in reasonably good health with no major branch mortality or large broken branches. Less than 10% cumulative defoliation, discoloration, and crown dieback is present. |
| 2. | 10%–25% cumulative defoliation, discoloration, and crown dieback is present and/or crown area missing based on visual evidence of large broken (not pruned) or dead branches less than 26%. |
| 3. | 26%–50% cumulative defoliation, discoloration, and crown dieback is present and/or crown area missing based on visual evidence of large broken (not pruned) or dead branches less than 50%. |
| 4. | More than 50% cumulative defoliation, discoloration, and crown dieback is present and/or crown area missing based on visual evidence of large broken (not pruned) or dead branches more than 50%. |
| 5. | Tree is dead or missing. |