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1.3-2.1 mm.
Apterous: elongate, pale green to yellowish green, with a darker green longitudinal line on dorsum; cornicles straight and medium in length.
Alate: pale green, antennae short and processus terminalis long, abdomen without pigmentation, cornicles straight, cylindrical, short and darkened a little at tip, cauda elongate and pale, wing with medial vein once-branched.

See identification file

Monoecious holocyclic.
Certain populations can be anholocyclic in zones with mild climate.

Poaceae, crop species: Avena (oats), Hordeum (barley), Triticum (wheat), Sorghum (millet), Zea (maize) and meadow plants: Bromus (brome), Dactylis (cocksfoot), Festuca (fescue) or wild grass species.

S. graminum is a highly significant pest on cereal crops in the United States.
It is infrequent in France and present mainly around Mediterranean Rim.

S. graminum induces small spots reddish on leaves due to toxicity of its saliva, the leaves dry out, the ears atrophy and abort.
The attacks are characterized by the development of a focus of infestation in the fields.
It is a vector of barley yellow dwarf viruses (BYDV).