WSU Extension

Hortsense

Common Diseases : Dwarf mistletoe
(revision date: 4/30/2013)


Biology
Dwarf mistletoe is a parasitic plant that grows on the branches or occasionally on the trunk of a host tree, such as Douglas-fir, true firs, larch, pine, and junipers. It is yellow-green, olive-green, or somewhat reddish in color and grows in clusters. The tree's branches become swollen and spindle-shaped at the infection site, and may develop witches' brooms. Severe infestations can greatly reduce growth of the host tree, sometimes causing dieback or death. However, since dwarf mistletoe survival depends on the survival of the host plant, death of entire trees is fairly uncommon. Dwarf mistletoe spreads by seeds.
Management Options

Non-Chemical Management
  • Remove mistletoe from host tree by pruning out witches' brooms or hand-picking the parasite.
Select non-chemical management options as your first choice!

Chemical Management

None recommended

Images
    - hide images

+ Show larger images

 
Caption: Dwarf mistletoe
Photo by: R.S. Byther