Plagiotrochus cornigerus O. S. Bisexual form

Ovoid, whitish leaf galls, 1.5 - 2.5 mm long, along midrib or major veins.

Adults in July.

On Q. rubra, Q. palustris, Q. imbricaria, Q. ilicifolia.

Ovoid, whitish galls, along midrib or larger veins, 1/15 to 1/10 inch long, on Spanish oak, pin and scrub oaks, early summer, sexual generation, gall wasp

- EP Felt: (1940) Plant Galls and Gall Makers^©

Reference: https://babel.hathitrust.org/cgi/pt?id=wu.89041294323&view=1up&seq=37