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Golden oak apple gall wasp (Andricus vaccinifoliae)

The golden oak apple gall wasp (Andricus vaccinifoliae, previously Trichoteras vaccinifoliae) induces galls on huckleberry and canyon live oaks. Each individual gall is about 30mm in diameter, but the cross sections below reveal that the central larval chamber is significantly smaller (~4mm) and suspended by numerous radiating fibers.


Golden oak apple gall wasp (Andricus vaccinifoliae) galls on huckleberry oak (Quercus vacciniifolia). Eldorado National Forest, Sierra Nevada, El Dorado County, California, USA.
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Golden oak apple gall wasp (Andricus vaccinifoliae) galls on huckleberry oak (Quercus vacciniifolia). Eldorado National Forest, Sierra Nevada, El Dorado County, California, USA.
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Cross section of an Golden oak apple gall wasp (Andricus vaccinifoliae) gall, revealing the developing larva within. Eldorado National Forest, Sierra Nevada, El Dorado County, California, USA.
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Golden oak apple gall wasp (Andricus vaccinifoliae), intermediate cross section of the gall. Eldorado National Forest, Sierra Nevada, El Dorado County, California, USA.
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Golden oak apple gall wasp (Andricus vaccinifoliae), extreme close-up cross section of the gall. Eldorado National Forest, Sierra Nevada, El Dorado County, California, USA.
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Next Gall: Woolly gall wasp (Heteroecus dasydactyli)



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All images copyright Timothy Boomer. All rights reserved worldwide.