Agromyza schineri

Irregular oval swellings on smaller twigs, length 1/8 inch

Hexomyza schineri
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Hosts: Cottonwoods, poplars, and especially aspen

Young branches can support dozens of these galls, sometimes in chains with one gall after another.

Euhexomyza schineri (Giraud)
new combination
...
Agromyza schineri Giraud, 1861: 484. Malloch 1913: 327; Spencer 1966: 42 [lectotype designation].
Melanagromyza schineri. Hendel 1920: 128, 1931: 174; Frick 1952: 379; Sasakawa 1961: 349.
Hexomyza schineri. Spencer 1966: 42, 1969: 81, Spencer 1980: 29, 1990: 81; Spencer and Steyskal 1986: 36; Gil-Ortiz et al. 2012: 275 [Spain].

Euhexomyza schineri (Giraud)
new combination
...
Agromyza schineri Giraud, 1861: 484. Malloch 1913: 327; Spencer 1966: 42 [lectotype designation].
Melanagromyza schineri. Hendel 1920: 128, 1931: 174; Frick 1952: 379; Sasakawa 1961: 349.
Hexomyza schineri. Spencer 1966: 42, 1969: 81, Spencer 1980: 29, 1990: 81; Spencer and Steyskal 1986: 36; Gil-Ortiz et al. 2012: 275 [Spain].
...
Host: Populus species; records from Salix species in Sasakawa (1961) are considered dubious by Spencer and Steyskal (1986).

Agromyza schineri Giraud.

Quaking Aspen {Populus tremuloides Michx.) Although quaking aspen belongs with the Poplars, it is a more common tree in north central Illinois. The gall is a rather irregular, oval swelling on smaller twigs. The gray-green color of these twig galls resembles that of the twigs themselves. Note that the new, leafy shoots appear to grow itself. (KB)

Populus spp. The larva forms twig-galls which are somewhat larger and more spherical than those of [Hexomyia] salicis [syn: Euhexomyia salicis].