Swollen terminal bud

Swollen buds are ovoid, 1-2cm in length, and up to 1cm in diameter. The swelling is soft and often bright red when it appears at the time the buds are leafing out in early spring. Leaves beyond the swelling and the bud usually die. Multiple branches may later appear below the base of the gall.

Host: P serotina
Distr: New York to Virginia, and Nebraska.

- Raymond J. Gagne: (1989) The plant-feeding gall midges of North America^©