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Plate Gall Wasp (Feron pattersonae)

The plate gall wasp (Feron pattersonae, formerly Andricus pattersonae) is a cynipid species which induces flat summer-generation galls on the leaves of many "white" oak species. These amorphously-margined galls are generally yellowish green and may be quite inconspicuous on the lower leaf surfaces where they form. The spring-generation galls are tall and skinny with a pear-shaped bulge near the apex. This generation was previous thought to be a separate species called the hair stalk gall wasp (Andricus pedicellatus or Dros pedicellatum).


Galls induced by the plate gall wasp (Feron pattersonae) [right] and the striped volcano gall wasp (F. atrimentum) [left] on a single leaf of blue oak (Quercus douglasii). Vacaville, Solano County, California, USA.
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Spring-generation gall induced by the plate gall wasp (Feron pattersonae). Formerly known as the hair stalk gall wasp (Andricus pedicellatus). Focus-stacked composite. Vacaville, Solano County, California, USA.
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Spring-generation gall induced by the plate gall wasp (Feron pattersonae). Extreme close-up photographed at 2:1. Formerly known as the hair stalk gall wasp (Andricus pedicellatus). Focus-stacked composite. Vacaville, Solano County, California, USA.
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Spring-generation gall induced by the plate gall wasp (Feron pattersonae). Shown with adult finger for scale. Vacaville, Solano County, California, USA.
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Next Gall: Red cone gall wasp (Feron kingi)



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All images copyright Timothy Boomer. All rights reserved worldwide.