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Oak Gall Wasps (Cynipini)
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Kokkocynips
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Kokkocynips rileyi
Photo#470283
Copyright © 2010
Jon Hart
Odd Oak Gall -
Kokkocynips rileyi
Montrose, Laurens County, Georgia, USA
October 31, 2010
Size: unrecorded
I haven't ever seen this kind of gall before. What sort of (I am assuming) wasp makes this?
Images of this individual:
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Contributed by
Jon Hart
on 6 November, 2010 - 2:54pm
Last updated 18 October, 2016 - 7:43pm
Moved
Moved from
Unidentified deciduous galls attached to veins on red oak leaf undersides
.
…
Charley Eiseman
, 18 October, 2016 - 7:43pm
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Moved
Moved from
Gall Wasps
.
I just wrote a
blog post
about these galls. I'd forgotten that you had posted these images, but since then I and a few other people have found them in Massachusetts and Maryland on red oak, and they apparently occur in Illinois as well.
…
Charley Eiseman
, 1 February, 2012 - 10:47am
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Moved
Moved from
Unidentified Galls
. Weld only lists three types of detachable galls on
Quercus nigra
, and all are simply described as "globular." This does resemble the gall of
Dryocosmus deciduus
, but that one erupts in clusters from an opening in the midvein, whereas this one looks like it's barely attached. I bet it's another species of
Dryocosmus
--maybe it's a gall that's known from another species of oak.
…
Charley Eiseman
, 25 November, 2010 - 5:20pm
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ID Request
.
…
Ken Wolgemuth
, 25 November, 2010 - 12:42pm
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Host plant?
Identification of the gall would be greatly enhanced by identification of the host tree species. If you're not sure, post a photo with a wider view of the leaf and we'll try to ID that for you. Also, be sure to note whether the galls are on the upper or the lower surface of the leaf.
…
John Pearson
, 6 November, 2010 - 11:24pm
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It was on
an oak (I'm not sure which kind) leaf on the topside attached to the central vein. If it helps I can post a photo of the entire leaf to clarify the exact species. We have several kinds of oak in the front and back (red, pin, white, etc.), but I haven't gotten around to ID'ing them specifically.
…
Jon Hart
, 7 November, 2010 - 7:56am
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Water Oak?
Looks like a water oak from the foliage, but not sure.
…
Sara Rall
, 7 November, 2010 - 5:14pm
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Yes
Water Oak
(
Quercus nigra
)
, a member of the red oak group.
…
John Pearson
, 7 November, 2010 - 5:54pm
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Correction.....
I don't know where my head is these days, but that should read "oak leaf on the *downside*".... *not* on the top. Sorry about that...
…
Jon Hart
, 7 November, 2010 - 3:45pm
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Photo
Yes, a photo of an entire leaf of this oak tree would be helpful because many galls are specific to species within
Quercus
.
…
John Pearson
, 7 November, 2010 - 8:03am
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Bears some resemblance to
Dryocosmus deciduus
:
But I know nothing about these, and I'm sure there are other possibilities. Wait to hear from Charley. :)
…
Ken Wolgemuth
, 6 November, 2010 - 5:38pm
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Looks delicious
It looks like creamy topping on top of dessert fruit or chocolate.
…
John F. Carr
, 6 November, 2010 - 3:22pm
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