Cornaphis populi Gillette

Galls on Populus angustifolia are crescent-shaped folds of the leaf-edge, pale or streaked with red. In western USA (Wyoming, Colorado, Utah). Apterae inhabit the same galls as the slate-grey fundatrices, and are straw-yellow with black head and four dark patches on the pronotum, dusted with wax. There is no host alternation; alate sexuparae (BL 2.0-2.3 mm) are produced in the galls in July (Gillette 1913, Palmer 1952).

Cornaphis populi Gillette

Collections. On Populus augustifolia in pale or red-streaked podlike pseudo galls composed of folded edges of leaves. Colorado: Monte Vista, South Saint Vrain Canyon and Fort Collins. Wyoming: Laramie. Fundatrices June 25, apterous summer viviparae and alate sexuparae July 10 to 15, sexuales July 15; rare. Fundatrix, apterous fundatrigeniae and sexuparae all develop in the same gall.