TABLE 12.2–Relative rates of diameter growth in relation to intensity of infection by Arceuthobium as quantified with the 6-class dwarf mistletoe rating system (DMR)
  Percentage growth of infected trees
Arceuthobium Host class 1 class 2 class 3 class 4 class 5 class 6
A. abietinum Abies concolor 100 100 98 95 70 50
A. americanum Pinus contorta 100 100 100 94 80 59
A. campylopodum Pinus ponderosa 100 100 98 86 73 50
A. douglasii Pseudotsuga menziesii 98 97 85 80 52 44
A. laricis Larix occidentalis 94 92 88 84 58 54
A. vaginatum Pinus ponderosa 100 100 98 86 73 50
Note: Diameter growth rates of uninfected trees taken as 100%. Percentages based on averages of several studies throughout the western United States (adapted from Hawksworth and others 1992c).

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