WSU Extension

Hortsense

Oak
 
Disease
Anthracnose 
Armillaria root rot 
Leaf scorch 
Mistletoe 
Sudden oak death 
Insect
California gallfly 
Jumping oak gall 
Leaf galls 
Oak leaf phylloxera 
Oak ribbed casemaker 
Oak treehoppers 
Pit scale 
Stem galls 
Western oak looper 



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Caption: Oak mistletoe (a true mistletoe)
Photo by: J.W. Pscheidt
  
Oak : Mistletoe
(revision date: 4/28/2014)


Biology
Mistletoe is a parasitic plant which grows on the branches of a host tree. True mistletoe, found on oaks and a few other hardwood species, does not grow on conifers. It is spread by seeds ingested by birds and carried to new hosts. True mistletoe is a perennial plant. Leaves are olive-green and leathery. Seeds are borne in white berries. Host tree branches often develop large swellings at the point of mistletoe attachment. Branches are weakened at the attachment point and often break in storms. Mistletoe is also an aesthetic problem, since the large growths can be unsightly. All parts of mistletoe are considered poisonous.
Management Options


Non-Chemical Management
  • Remove mistletoe by pruning out infected branches or hand-picking the parasite.
  • Heavily infested trees may be removed and replaced with non-host trees such as conifers.
  • Commonly affected oaks include white (Quercus garryana), black (Q. kelloggii), red (Q. rubra), scarlet (Q. coccinea), and pin (Q. palustris).
Select non-chemical management options as your first choice!

Chemical Management

None recommended

Images

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Caption: Oak mistletoe (a true mistletoe)
Photo by: J.W. Pscheidt