Diplolepis dichlocerus

Stem swellings
Fusiform, up to 50 by 13 mm covered with prickers, rarely smooth.

[Photo caption]
322. On stem of wild rose.

On a wild rose. Adults out May 22-June 21 (Chi). Some females were liberated on a small wild rose recently transplanted to a greenhouse and having fresh shoots 5-6 mm high. On May 25 a female was seen ovipositing near the top of one of these shoots. On June 5 a belt of glandular hairs at this point was the first evidence of gall formation and by June 18 the gall was 5 mm. in diameter. Adults emerged from this gall in the greenhouse the next spring before March 15.

- LH Weld: (1959) Cynipid galls of the eastern United States^©

Reference: https://www.biodiversitylibrary.org/item/273718#page/95/mode/1up