WSU Extension

Hortsense

Caption: Madrone leaf gall (blisters) on leaves
Photo by: R.S. Byther
  
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Madrone : Leaf gall
(revision date: 4/28/2014)


Biology
Leaf gall in madrone is caused by a fungus that infects leaf tissue. From late spring to mid-summer, fruiting bodies emerge from the leaf tissue, rupture the cuticle, and release their spores. Leaves become enlarged, discolored, and may exhibit a white, velvety appearance on one side. Spores in turn germinate on wet surfaces and may cause new infections of young, late-developing stems and leaves.
Management Options

Non-Chemical Management
  • Hand pick galls or prune localized infections before sporulation in summer.
Select non-chemical management options as your first choice!

Chemical Management


None recommended

Images
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Caption: Madrone leaf gall (blisters) on leaves
Photo by: R.S. Byther
Caption: Madrone leaf gall (blisters) on fruit
Photo by: R.S. Byther