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The Rocky Mountain population is severely threatened by an introduced fungal disease known as white pine blister rust, and by pine beetles.
A study in the mid-2000s showed whitebark pine had declined by 41 percent in the Western Cascades, due to two threats: white pine blister rust and mountain pine beetles.
This plant is an alternate host for the white pine blister rust (Cronartium ribicola), the vector of a pine tree disease.
This currant species is susceptible to white pine blister rust (Cronartium ribicola), a fungus which attacks and kills pines, so it is sometimes eradicated from forested areas where the fungus is active to prevent its spread.
Western white pine (Pinus monticola) has been seriously affected by the white pine blister rust (Cronartium ribicola), a fungus that was accidentally introduced from Europe in 1909.
An introduced fungal disease known as white pine blister rust (Cronartium ribicola) is believed to affect some individuals.