Susceptibility of Whitebark Pine to Blister Rust in the Pacific Northwest

Whitebark pine, although of little commercial value, is often of considerable importance in connection with recreation and watershed protection. Studies in nursery beds and in natural stands show that in the Pacific Northwest it is much more susceptible to blister rust than is western white pine. Infection will probably become common during the next few decades, but it is doubtful whether the species will be particularly influential in hastening the spread of the disease in this region. Control by ribes eradication may be supplemented, where scenic values warrant, by the pruning of infected branches.