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

National Moth Week photos of insects and people. Here's how to add your images.

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

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

Photos of insects and people from the 2015 gathering in Wisconsin, July 10-12

Photos of insects and people from the 2014 gathering in Virginia, June 4-7.

Photos of insects and people from the 2013 gathering in Arizona, July 25-28

Photos of insects and people from the 2012 gathering in Alabama

Photos of insects and people from the 2011 gathering in Iowa


TaxonomyBrowseInfoImagesLinksBooksData
Photo#357564
Wool sower gall on Quercus alba: Callirhytis seminator - Callirhytis seminator

Wool sower gall on Quercus alba: Callirhytis seminator - Callirhytis seminator
Raleigh, near Rts 50 and US 70. Lake Lynn City Park., Wake County, North Carolina, USA
April 20, 2007
Size: Baseball
Several of these galls on young white oak trees near each other. Older trees were just getting new leaves. I read that this is the "leaf gall" of the wasp. It appeared to be around a young branch.

"leaf gall"
These galls are always attached to twigs, as you observed. I think the term "leaf gall" must refer to the fact that this is a spring gall--the gall that produces the sexual generation, which tends to be a succulent gall on a bud, flower, or leaf--as opposed to the autumnal gall, which produces parthenogenetic females (many of these are twig galls, but there are plenty that are leaf galls, acorn galls, etc.). Why someone would choose to call it a "leaf gall" rather than a "spring gall" is a mystery to me.

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