Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada
 

Register · Log In
HomeGuideID RequestRecentFrassForumsDonateHelp
Clickable Guide
Moths Butterflies Flies Caterpillars Flies Dragonflies Flies Mantids Cockroaches Bees and Wasps Walkingsticks Earwigs Ants Termites Hoppers and Kin Hoppers and Kin Beetles True Bugs Fleas Grasshoppers and Kin Ticks Spiders Scorpions Centipedes Millipedes

Calendar
Upcoming Events

Registration is open for the 2024 BugGuide gathering in Idaho July 24-27

Moth submissions from National Moth Week 2023

Photos of insects and people from the 2022 BugGuide gathering in New Mexico, July 20-24

Photos of insects and people from the Spring 2021 gathering in Louisiana, April 28-May 2

Photos of insects and people from the 2019 gathering in Louisiana, July 25-27

Photos of insects and people from the 2018 gathering in Virginia, July 27-29


Previous events
TaxonomyBrowseInfoImagesLinksBooksData
Home » Guide » Arthropods (Arthropoda) » Hexapods (Hexapoda) » Insects (Insecta) » Ants, Bees, Wasps and Sawflies (Hymenoptera) » "Parasitica" - Parasitoid Wasps » Cynipoidea » Gall Wasps (Cynipidae) » Oak Gall Wasps (Cynipini) » Acraspis » Jewel Oak Gall Wasp (Acraspis quercushirta)
Photo#353801
warty leaf gall on bur oak - Acraspis quercushirta
Copyright © 2009 John Pearson

warty leaf gall on bur oak - Acraspis quercushirta
Ackworth, Warren County, Iowa, USA
November 21, 2009
Size: 4 mm diameter
Warty-surfaced, hollow, spherical gall on lateral vein of underside of dried, fallen leaf of bur oak (Quercus macrocarpa) in rural yard. Many bur oak leaves piled against a fenceline had these galls; most were on the lower surface of the leaves, but a few were on the upper surface. On this specimen, the upper leaf surface opposite the gall showed no effect.

Images of this individual: tag all
warty leaf gall on bur oak - Acraspis quercushirta warty leaf gall on bur oak - Acraspis quercushirta
tag · login or register to post comments
Contributed by John Pearson on 21 November, 2009 - 5:35pm
Last updated 18 November, 2015 - 9:34am

Bur oak?
That leaf looks awfully densely pubescent. Are you sure that it isn’t a swamp white oak?

I have seen galls similar to the other galls on that leaf, but on swamp white oak in the Chicago area. Which brings me to another question, does anyone have any idea about what the other galls are? I’ve tentatively ID’d the similar galls I’ve seen as Neuroterus saltarius. Although that species grows both on bur oak and swamp white oak, which doesn’t help to identify the leaf in your picture. Considering that bur and swamp white oak share so many gall-producing species and hybridize pretty commonly, is it possible that Acraspis macrocarpae can grow on swamp white oak?

Also, did you get pictures of the upper surface of the leaf?
… Chaemerion, 28 December, 2018 - 8:54pm login or register to post comments

 
Yes, but oak for sure
Hello Chaemerion, that leaf definitely came from a bur oak (it is from a tree in my yard that I know very well), but I can see how it could be taken as a swamp white oak based on the pubescence. You are correct that the other, smaller galls (or remnants thereof) are Neuroterus saltarius, of which I have other photos of leaves from the same tree:
… John Pearson, 31 December, 2018 - 8:30am login or register to post comments

Acraspis macrocarpae
Moved from ID Request. If there weren't those short points on the facets, I'd say Acraspis quercushirta instead. Two cells inside instead of one would likely indicate A. pezomachoides.
… Charley Eiseman, 24 November, 2009 - 1:39pm login or register to post comments

Comment viewing options
Select your preferred way to display the comments and click 'Save settings' to activate your changes.

Disclaimer: Dedicated naturalists volunteer their time and resources here to provide this service. We strive to provide accurate information, but we are mostly just amateurs attempting to make sense of a diverse natural world. If you need expert professional advice, contact your local extension office.

Contributors own the copyright to and are solely responsible for contributed content.
Click the contributor's name for licensing and usage information.
Everything else copyright © 2003-2024 Iowa State University, unless otherwise noted.

Bugguide is hosted by:

Plant Pathology, Entomology and Microbiology at Iowa State University logo

Printer Friendly Version 		Terms of Use
Privacy Statement
Site Map
Contact