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Oak apple wasp (Trichoteras vaccinifoliae)

The oak apple wasp (Trichoteras vaccinifoliae, previously Andricus 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.


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



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All images copyright Timothy Boomer. All rights reserved worldwide.