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Hair Stalk Gall Wasp (Andricus pedicellatus)

The hair stalk gall wasp (Andricus pedicellatus, formerly Dros pedicellatum) induces tall and incredibly thin galls on the leaf margins of a variety of white oaks. These are spring-generation galls containing both males and females; no unisexual summer generation counterpart has yet been discovered.


Hair stalk gall wasp (Andricus pedicellatus), single gall on blue oak (Quercus douglasii). Focus-stacked composite. Vacaville Open Space, Solano County, California, USA.
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Hair stalk gall wasp (Andricus pedicellatus), focus-stacked composite photographed at 2x lifesize. Vacaville Open Space, Solano County, California, USA.
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Hair stalk gall wasp (Andricus pedicellatus), gall shown with adult finger for scale. Vacaville Open Space, Solano County, California, USA.
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Next Gall: Leaf gall wasp (undescribed Cynipidae)



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All images copyright Timothy Boomer. All rights reserved worldwide.