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Convoluted gall wasp (Andricus confertus)

The convoluted gall wasp (Andricus confertus) is a cynipid wasp which induces pinkish, finely hairy gall clusters. Each cluster is actually comprised of multiple galls pressed closely together, resulting in a convoluted mass somewhat reminiscent of a brain. Since this gall appears exclusively on the leaves of valley oak (Quercus lobata), its presence can be used to differentiate the host tree from other oaks.


Convoluted gall wasp (Andricus confertus) gall cluster on underside of a valley oak leaf. Davis, Yolo County, California, USA.
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Convoluted gall wasp (Andricus confertus), portrait orientation. Davis, Yolo County, California, USA.
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Convoluted gall wasp (Andricus confertus), highly detailed close-up of a cluster of galls. Davis, Yolo County, California, USA.
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Next Gall: Coral gall wasp (Burnettweldia corallina)



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All images copyright Timothy Boomer. All rights reserved worldwide.