EAB-specific assessment scheme.
| Category | Vigor class | |||
|---|---|---|---|---|
| Good | Fair | Poor | Critical | |
| Biotic factors | No significant damage | Damage is evident but from a non-fatal causal agent | Damage is significant and by a potentially fatal agent | Damage is probably fatal; tree is unsalvageable |
| Crown condition | Full, balanced, <10% thinning | Imbalance is evident, 10%–30% thinning | Imbalance is significant, 30%–80% thinning | Crownless, >80% thinning |
| Structural problems | None | Minor, or if tree appears to have been topped | Significant | Major |