Western Dwarf Mistletoe Infects Understory Jeffrey Pine Seedlings on Cleveland National Forest, California

摘要

Many young, understory Jeffrey pines (Pinus jeffreyi) were found to be infected by western dwarf mistletoe (Arceuthobium compylopodum) 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.