WSU Extension


Common Diseases
Armillaria root rot 
Botrytis blight (Gray mold) 
Crown gall 
Dead roots 
Downy mildew 
Dwarf mistletoe 
Leaf spots and blights 
Nectria cankers 
Phytophthora root rot 
Powdery mildew 
Pseudomonas bacterial canker 
Root rots 
Sclerotinia white mold 
Sudden oak death 
Tubercularia canker 
Verticillium wilt 

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Caption: Dwarf mistletoe
Photo by: R.S. Byther
Common Diseases : Dwarf mistletoe
(revision date: 4/30/2013)

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


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