Andricus tubularius

Quercus subturbinella [turbinella]
Stem galls
Bursting out of cracks in bark or cells hidden under bark
Fig 48.

Andricus tubularius, new species

Host. — Quercus undulata.

Gall (fig. 22). — Smooth, tan-colored, blunt, cylindrical cells bursting out through the bark singly or in vertical rows of 2-6, only the upper third or less protruding, not deciduous. Single cells measure 3.2 mm. long by 1.7 mm. in diameter with Avail .1-.2 mm. thick.
Occur in early summer on small twigs of previous season's growth. Exit hole at apex and old galls show as a row of holes.

Andricus tubularius
Ruptured-Stem Gall Wasp

Hosts: Quercus turbinella

In October, stems rupture, exposing rows of yellow, egg-like larval capsules. These integral, polythalamous stem galls can easily exceed 15 mmm in length and 6 mm in diameter.