Pediasia contaminella is a species of moth in the family Crambidae described by Jacob Hübner in 1796.[1] It is found in almost all of Europe,[2] Asia Minor, the Caucasus, Transcaucasia, Iraq, Iran, the Kopet Dagh and Minusinsk.
The wingspan is 17–19 mm.[3] It differs from Pediasia aridella as follows : forewings without blackish submediaii streak from base, median line less oblique, with more strongly marked discal indentation, nearly parallel to second.[4]
Adults are on wing in July and August.[5]
The larvae feed on Poa species (including Poa maritima and Poa borreri) and Festuca ovina.[6] They live in a silken tube.