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Two-Horned Gall Wasp (Dryocosmus dubiosus)

The two-horned gall wasp (Dryocosmus dubiosus) induces tiny, summer-generation galls on interior and coast live oaks, along the veins of the lower leaf surface. Spring generation galls form on the catkins of the same host trees.


Two-horned gall wasp (Dryocosmus dubiosus), summer-generation gall shown in great detail. Focus-stacked composite of 58 exposures at 5x lifesize. Browns Valley Open Space Preserve, Solano County, California, USA.
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Two-horned gall wasp (Dryocosmus dubiosus), summer-generation gall with short "horns." Focus-stacked composite of 68 exposures at 3x lifesize. Browns Valley Open Space Preserve, Solano County, California, USA.
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Two-horned gall wasp (Dryocosmus dubiosus), summer-generation gall on interior live oak (Quercus wislizeni). Focus-stacked composite. Lake Berryessa, Napa County, California, USA.
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Two-horned gall wasp (Dryocosmus dubiosus), gall shown with a standard pencil tip for scale. Lake Berryessa, Napa County, California, USA.
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Next Gall: Beaked spindle gall wasp (Heteroecus pacificus)



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All images copyright Timothy Boomer. All rights reserved worldwide.