Furry Oak Leaf Gall Wasp

Callirhytis furva

Callirhytis furva is a wasp that forms galls on oak leaves. It is in the family Cynipidae.
Callirhytis furva Galls Small galls growing in clusters on the upperside of oak leaves. They were about 3 mm wide and had short, brown hairs.

Habitat: Oak tree bordering a meadow
https://www.jungledragon.com/image/74336/callirhytis_furva_galls.html
https://www.jungledragon.com/image/74334/callirhytis_furva_galls.html
https://www.jungledragon.com/image/74333/callirhytis_furva_galls.html Callirhytis,Callirhytis furva,Fall,Geotagged,United States,galls,oak galls

Appearance

Forms galls on leaves of Quercus nigra and Q. paiustris; "probably on all the red oaks"

Small cluster of globular galls, 3-4 mm, each covered with short, straight brown hairs, upper side
Furry Oak Leaf Gall Wasp (Callirhytis furva) on Water Oak (Quercus nigra) Fuzzy gall found on Water Oak (Quercus nigra) near a lake re-regulation reservoir. Callirhytis furva,Geotagged,Summer,United States

Behavior

Galls drop from leaves in October; adults emerge in the second or third spring in late March.

References:

Some text fragments are auto parsed from Wikipedia.

https://bugguide.net/node/view/356680
Taxonomy
KingdomAnimalia
DivisionArthropoda
ClassInsecta
OrderHymenoptera
FamilyCynipidae
GenusCallirhytis
SpeciesCallirhytis furva