Austrian pine foliar rating scale
| Rating | Description | Percent of foliage affected |
|---|---|---|
| 1 | Green, healthy canopy | 0% foliar symptoms |
| 2 | Green canopy, symptoms of stress | 1-24% yellow to red foliage |
| 3 | Canopy stressed or infected | 25-49% yellow to red foliage |
| 4 | Canopy in decline | 50-74% yellow to red foliage |
| 5 | Tree in severe decline or dead | 75-100% yellow to red foliage |