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Title: Western dwarf mistletoe infects understory Jeffrey pine seedlings on Cleveland National Forest, California
Author: Scharpf, Robert F.; Vogler, Detlev
Source: Res. Note PSW-RN-386. Berkeley, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station. 2 p
Station ID: RN-PSW-386
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.
Keywords: Arceuthobium campylopodum dwarf mistletoe, forest diseases, Jeffrey pine, mistletoes—host resistance, Pinus jeffreyi—injury by mistletoe, reproduction, understory vegetation
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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.