Western dwarf mistletoe infects understory Jeffrey pine seedlings on Cleveland National Forest, California

Robert F. Scharpf; Detlev R. Vogler

doi:10.2737/PSW-RN-386

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Western dwarf mistletoe infects understory Jeffrey pine seedlings on Cleveland National Forest, California

Informally Refereed

Authors:

Robert F. Scharpf, Detlev R. Vogler

Year:

1986

Type:

Research Note

Station:

Pacific Southwest Research Station

DOI:

https://doi.org/10.2737/PSW-RN-386

Source:

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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Abstract

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.

Keywords

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

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.