WSU Extension

Hortsense

Caption: Dwarf mistletoe
Photo by: R.S. Byther
  
print version| pdf version| email url    

Pine : Dwarf mistletoe
(revision date: 4/23/2014)


Biology
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

Images
    - hide images

+ Show larger images

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