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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.  El Dorado County, CA. Stock Photo ID=GAL0041
Oak apple wasp (Trichoteras vaccinifoliae) galls on huckleberry oak (Quercus vacciniifolia). Sierra Nevada, El Dorado County, California.
GAL0041

Oak apple wasp (Trichoteras vaccinifoliae) galls.  El Dorado County, CA. Stock Photo ID=GAL0042
Oak apple wasp (Trichoteras vaccinifoliae) galls on huckleberry oak (Quercus vacciniifolia). Sierra Nevada, El Dorado County, California.
GAL0042

Oak apple wasp (Trichoteras vaccinifoliae) gall cross section.  El Dorado County, CA. Stock Photo ID=GAL0043
Cross section of an oak apple wasp (Trichoteras vaccinifoliae) gall, revealing the developing larva within. Sierra Nevada, El Dorado County, California.
GAL0043

Oak apple wasp (Trichoteras vaccinifoliae) gall cross section.  El Dorado County, CA. Stock Photo ID=GAL0044
Oak apple wasp (Trichoteras vaccinifoliae), intermediate cross section of the gall. Sierra Nevada, El Dorado County, California.
GAL0044

Oak apple wasp (Trichoteras vaccinifoliae) gall cross section, extreme close up.  El Dorado County, CA. Stock Photo ID=GAL0045
Oak apple wasp (Trichoteras vaccinifoliae), extreme close-up cross section of the gall. Sierra Nevada, El Dorado County, California.
GAL0045

Next Gall: Woolly gall wasp (Heteroecus dasydactyli)



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All images copyright Timothy Boomer. All rights reserved worldwide.