Elachista obliquella is a moth of the family Elachistidae found in Europe.
The wingspan is 8–.The head is ochreous- whitish. Antennae whitish-ringed. Forewings light grey, irrorated with blackish ;a nearly straight central whitish fascia, sometimes ochreous tinged,in male slenderer and sometimes interrupted ; tips of apical cilia whitish. Hindwings are grey. The larva is grey-greenish ; head pale brown; 2 with two brownspots.[1]
Adults are on wing from April to July and again in August in two generations per year.[2]
The larvae feed on tor-grass (Brachypodium pinnatum), false-brome (Brachypodium sylvaticum), Bromopsis erecta, Bromopsis ramosa, reed grass (Calamagrostis species), acute sedge (Carex acuta), Carex hudsonii, Carex ornithopoda, Carex spicata, Carex sylvatica, cock's-foot (Dactylis glomerata), tufted hairgrass (Deschampsia cespitosa), fescue (Festuca species), wood-barley (Hordelymus europaeus), crested hair-grass (Koeleria macrantha), melic (Melica species) milletgrass