Number and percentage of trees for different pitch canker ratings, 1987 versus 1992.
| Pitch canker rating | 1987 | 1992 |
|---|---|---|
| 0 | 18 | 8 |
| 40% | 21% | |
| 1 | 21 | 12 |
| 2 | 21 | 10 |
| 32% | 26% | |
| 3 | 10 | 15 |
| 4 | 10 | 16 |
| 5 | 9 | 6 |
| 28% | 54% | |
| 6 | 8 | 13 |
| Dead | 0 | 17* |
↵*Of the 17 trees that died:
All 17 had pitch canker branch infections (crown rating ≥ 1).
16 had pitch canker bole infections (bole rating ≥ 1).
14 had overall pitch canker ratings ≥ 4.
8 had dead tops.
All 17 were attacked and colonized by bark beetles.