WSU Extension


Armillaria root rot 
Dwarf mistletoe 
Elytroderma needle cast 
Lophodermella needle cast 
Lophodermium needle cast 
Phytophthora root rot 
Western gall rust 
White pine blister rust 
Eriophyid mites 
European pine shoot moth 
Mountain pine beetle 
Pandora moth 
Pine aphid 
Pine bark adelgid 
Pine butterfly 
Pine needle scale 
Pine needle sheathminer (Pine sheath miner) 
Sequoia pitch moth 
Spider mites 
White pine weevil 

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Caption: Dwarf mistletoe
Photo by: R.S. Byther
Pine : Dwarf mistletoe
(revision date: 4/23/2014)

Dwarf mistletoe is a parasitic plant that grows on the branches of a host tree. It is yellow-green, olive-green, or somewhat orange in color and grows in clusters to about four inches high. The tree's branches may be swollen and spindle-shaped at the infection site (some pines show little or no swelling), and develop into witches' brooms. Severe infestations can greatly reduce growth of the host tree, sometimes causing dieback or death. 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.
  • Remove heavily infested trees and replace with non-host trees (broad-leaved trees, some conifers).
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