Ectoedema [sic] populella
Aspen petiole gall moth

Hosts: Poplar. Populus grandidentata, tremuloides

Globular to cylindrical, pea-sized galls form on the petioles just below the leaf-blade. Galls are the same color as the petiole and mostly 4 to 7 mm in diameter, but a few reach 10 mm in diameter. Heavily infested trees may have galls on nearly every leaf petiole. Heavy attacks cause early leaf fall in many shelterbelts or on shade and ornamental trees, but the impact generally is light.

Range: North central and northeastern US and from Manitoba to the Maritime Provinces in Canada

Ectoedemia populella

This subglobular, one-celled gall is found on the petiole at its union with the blade of the leaf. There are distinct longitudinal ridges. Color like that of the petiole. About 5-7 mm. in diameter. The cell-walls are 1-2 mm. thick. Very abundant on American aspen, Populus tremuloides. In October the larvae go down to pupate in the ground. The moth emerges in May.

Ectoedemia populella

Globose ridged petiole gall, diameter .25 inch, caterpillar

Ectoedemia populella
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Hosts: Populus tremuloides

Galls are brown, with furrows or shallow cracks over the surface.