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    Author(s): Robert F. Scharpf; Detlev Vogler
    Date: 1986
    Source: Res. Note PSW-RN-386. Berkeley, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station. 2 p
    Publication Series: Research Note (RN)
    Station: Pacific Southwest Research Station
    PDF: View PDF  (351 KB)

    Description

    Many young, understory Jeffrey pines (Pinus jeffreyi Grev. & Balf.) were found to be infected by western dwarf mistletoe (Arceuthobium campylopodum Engelm.) on Laguna Mountain, Cleveland National Forest, in southern California. Under heavily infected overstory, about three-fourths of the young pines (about 15 years old on the average) were infected by dwarf mistletoe. Infections per tree averaged about two and a half, two-thirds of these on the bole. Attempts to regenerate Jeffrey pine under an infected overstory in southern California will probably lead to a severely infected and damaged understory. Planting nonhost species or resistant selections of Jeffrey pine would be practical in managing dwarf mistletoe on these highly valuable forest recreational areas.

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    Citation

    Scharpf, Robert F.; Vogler, Detlev. 1986. Western dwarf mistletoe infects understory Jeffrey pine seedlings on Cleveland National Forest, California. Res. Note PSW-RN-386. Berkeley, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station. 2 p.

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    Keywords

    Arceuthobium campylopodum dwarf mistletoe, forest diseases, Jeffrey pine, mistletoes–host resistance, Pinus jeffreyi–injury by mistletoe, reproduction, understory vegetation

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