Callirhytis punctata

On Q velutina. Also on Q palustris, rubra, imbricaria, cinerea, nigra. [Agamic] adults emerged Apr 16 (MO, NY). The alternating generation is a small blister on main veins about May 12.

Callirhytis quercuspunctata (Bassett), the gouty oak gall, occurs from southern Canada to North Carolina and west to Illinois. It induces galls (fig. 202) on the twigs and smaller limbs of scarlet, pin, and black oaks. These galls are about 12 to 38 mm long and they frequently occur so close together that they form practically continuous masses. C. quercuspunctata has alternate generations. The first induces small blisterlike galls on the leaves near the veins in the spring. The second induces gouty galls during the summer. In heavy infestations, twigs, fairly large branches, and even entire trees may be killed. Shade trees are especially subject to damage.

Plagiotrochus punctatus Bass
Bi-sexual form,

Blister-like leaf galls, on or near veins, length 1-2 mm.

On Q rubra

Blister-like, narrowly oval galls on or near the veins, length 1/25 to 1/12 inch, on Spanish oak, early summer, sexual generation, gall wasp.