WSU Extension

Hortsense

Maple
 
Disease
Anthracnose 
Bacterial leaf spot and dieback 
Fasciation 
Leaf scorch 
Nectria canker 
Phyllosticta leaf spot 
Powdery mildew 
Tar spots 
Verticillium wilt 
Insect
Aphids 
Cottony maple scale 
Maple bladdergall mite 



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Caption: Maple bladder gall mite
Photo by: A.L. Antonelli
  
Maple : Maple bladdergall mite
(revision date: 6/24/2015)


Biology
The maple bladdergall mite is a tiny mite that feeds on the underside of leaves. The mites overwinter in cracks and under bark scales and begin feeding in spring. Infested leaves initially develop small depressions which soon grow into brilliant red galls 1/8" to 1/4" in length. Later in the season, the galls may turn green or black. Mite activity typically stops by around July. Silver and red maples are particularly susceptible to bladdergall mites. Severe infestations may cause leaves to become somewhat distorted. Although an aesthetic concern, bladdergalls are seldom harmful to the trees.
Management Options


Non-Chemical Management
  • Hand-pick severely infested or distorted leaves to improve appearance of small trees.
Select non-chemical management options as your first choice!

Chemical Management

None recommended.

Images

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Caption: Maple bladder gall mite
Photo by: A.L. Antonelli