| Additional mortality within infested stands | |||||||
| Arceuthobium | Host | class 1 | class 2 | class 3 | class 4 | class 5 | class 6 |
|---|---|---|---|---|---|---|---|
| A. abietinum | Abies concolor | 1 | 3 | 6 | 10 | 15 | 21 |
| A. americanum | Pinus contorta | 2 | 4 | 5 | 6 | 7 | 8 |
| A. douglasii | Pseudotsuga menziesii | 1 | 2 | 4 | 9 | 15 | 23 |
| A. vaginatum | Pinus ponderosa | 1 | 4 | 8 | 15 | 23 | 34 |
| Note: Additional mortality within infested stands is the increase in 10-year mortality rate (percent of trees dying per decade) over the mortality rate expected within uninfested stands; severity of infestation is quantified as average 6 class dwarf mistletoe rating for all live host trees (stand DMR). Based on averages of several studies throughout the western United States (adapted from Hawksworth and others 1992c). | |||||||