leaf galls on red oak - Polystepha pilulae
Ledges State Park, Boone, Boone County, Iowa, USA
July 31, 2011
Size: ~3 mm diameter
Several leaves on several Red Oak (Quercus rubra) trees supported these galls, whose density ranged from low to high (this leaf had high density). Photo of upper leaf surface.
Images of this individual: tag all