Dwarfmistletoe of Douglas-fir
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Dwarfmistletoe (Arceuthobium douglasii Engelm.), one of the most destructive enemies of Douglas-fir, causes serious losses in many stands. This parasitic plant is present almost everywhere within the range of Douglas-fir in the northern, central, and southern Rockies. It is abundant in eastern Washington and Oregon and is common in southwestern Oregon and northern California. It does not occur in the Douglas-fir forests west of the Cascades and north of the Siskiyou Mountains of Oregon.