WSU Extension

Hortsense

Caption: Maple bladder gall mite
Photo by: A.L. Antonelli
  
print version| pdf version| email url    

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
    - hide images

+ Show larger images

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