WSU Extension


Armillaria root rot 
Leaf scorch 
Sudden oak death 
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 treehoppers
Photo by: A.L. Antonelli
Oak : Oak treehoppers
(revision date: 6/24/2015)

The oak treehopper belongs to a family of plant lice distantly related to aphids. However, they are fairly hard-bodied and the adults bear a pointed hood on the back behind the head. They are quite attractive in that they are variably colored with red and cream stripes with some black spots below the hood in front. When numerous, these insects can kill twigs both by sucking the sap and by laying eggs in slits in the bark. They rarely cause serious damage to the trees.
Management Options

Non-Chemical Management
  • Hand remove when practical.
  • Hosing will work on non-winged nymphs; not adults.
Select non-chemical management options as your first choice!

Chemical Management

None recommended.


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Caption: Oak treehoppers
Photo by: A.L. Antonelli