Hecatera dysodea

Distinguished from similar Hecatera species by the combination of grey forewing ground color with orange-scaled markings, particularly the orange-spotted subterminal line. The pale to greenish-grey forewings with dark grey dusting and orange-accented lines separate it from H. bicolorata and related species. The two dark stigmata with orange scaling are diagnostic. In Britain, confusion most likely with H. bicolorata, which lacks the strong orange subterminal spotting and has more contrasting black-and-white forewing pattern.

Dry ruderal areas, brownfields, roadsides, embankments, gardens, and parks. Found at edges and open localities rather than closed vegetation. In the Alps, recorded up to 1400 m elevation.

Native range: Central and Southern Europe from the Baltic Sea and southern Lithuania through Belarus and south of Moscow to the Urals; south to North Africa (Algeria, Morocco); east through the Middle East, Turkestan, and across the Palearctic to Central Asia (including Asia Minor, Persia, Syria, Kashmir, and China). Introduced to North America: first recorded Utah 1998, Oregon 2005, now widespread in the Pacific Northwest. In Britain, historically widespread with peak abundance late 19th century, extinct by 1930s, rediscovered Kent 1997, now widespread in England and parts of Wales.

Adults on the wing from May to mid-August in Central Europe; two overlapping generations reported with flight period extending to October in some regions. Cocoons typically hatch in June when humidity increases.

Larvae feed on flowers and seeds of Asteraceae, specifically Lactuca species including Prickly Lettuce (Lactuca serriola), other wild lettuce species, and cultivated lettuce varieties.

• Lactuca serriola - larval food plantPrickly Lettuce; primary host
• Lactuca - larval food plantGenus level; includes cultivated varieties

Two overlapping generations reported (contrary to some sources stating one generation). Overwintering stage not explicitly documented in available sources. Pupation in cocoon; cocoons hatch in June with increased humidity.

Adults visit flowers, particularly of lettuce species. Strongly attracted to light. Larvae feed internally on flower heads and developing seeds.

Seed predator of Asteraceae, particularly Lactuca. Potential pest of lettuce seed crops due to larval feeding on bolted lettuce flowers and seeds.

Potential agricultural pest of lettuce seed production. Subject of conservation interest in Britain due to extinction-recolonisation history. Genome sequenced (640.9 Mb assembly, 32 chromosomal pseudomolecules, 12,213 protein-coding genes).

• Hecatera bicolorataSimilar size and habitat preference; distinguished by more contrasting black-and-white forewing pattern without strong orange subterminal spotting
• Hecatera cappaOverlapping distribution; H. dysodea distinguished by orange-scaled markings and greyer ground color

Some sources report a single generation, but two overlapping generations have been documented. The species name 'dysodea' has been interpreted as referring to 'ill-smelling' larvae, possibly alluding to the odor of bolting lettuce rather than an inherent larval smell.

• Noctuidae
• Lepidoptera
• Europe
• introduced species
• North America
• lettuce pest
• genome sequenced
• extinction-recolonisation

• BugGuide
• Wikipedia
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
• The genome sequence of the Small Ranunculus, Hecatera dysodea (Denis & Schiffermüller, 1775).