Introduced-range-north-america
Guides
Hypsopygia costalis
Gold Triangle, Clover Hayworm Moth, Clover Hay Moth
A small pyralid moth native to Europe, now established in eastern North America. Adults display a distinctive golden triangular marking on the forewings. The species is notable as a pest of stored hay and dried vegetation, with larvae feeding on clover and alfalfa hay. Adults are nocturnal, active from July through November in the British Isles, with earlier emergence (May–July) reported elsewhere. The genome has been sequenced, revealing 818 Mb across 31 chromosomal pseudomolecules.