| Blister rust (3) |  |
| Canker (4) | |
| Dutch elm disease (9) | |
| Wilt disease (2) | |
| Blister rust (3) | |
| Canker (4) | |
| Dutch elm disease (9) | |
| Wilt disease (2) | |
The trees also have been suffering from white pine blister rust a disease accidentally introduced via imported seedlings nearly a century ago
mountain pine beetles and blister rust fungus once thwarted by the cold, dry climate have devastated the trees,
There are plenty of highly-damaging invasive species in Western United states forests such as sudden oak death and white pine blister rust according to Frankel a plant pathologist with the Forest Service's Pacific Southwest Research Station.
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