Chrysoesthia sexguttella

Distinguished from other small gelechiids by the combination of metallic brassy-grey head and the distinctive yellow spotting pattern on dark forewings: a larger subdorsal spot and smaller posterior discal spot. The leaf mines are diagnostic: contorted, gallery-forming mines on the surface of Chenopodium and Atriplex leaves, often with visible frass trails. Similar Chrysoesthia species may differ in spot configuration and host plant associations.

Open, disturbed habitats including fields, gardens, roadsides, and coastal areas where host plants grow. Associated with weedy Chenopodium and Atriplex vegetation. Larval habitat is within the leaf tissue of host plants.

Native to Europe, ranging east to southern Siberia. Introduced and established in northeastern North America (possibly non-native there). Recorded from Belgium at multiple administrative levels.

Bivoltine: adults active May–June and August–September. Two generations per year in temperate regions.

Larva feeds as a leaf miner on leaves of Atriplex species (including A. patula, A. prostrata, A. littoralis, A. hortensis, A. hastata, A. nitens, A. sibirica, A. cakotheca), Chenopodium species (including C. album, C. bonus-henricus, C. giganteum, C. glaucum, C. hybridum, C. murale, C. opulifolium, C. polyspermum, C. quinoa, C. urbicum, C. vulvaria), Amaranthus blitum, Amaranthus caudatus, Bassia scoparia, and Spinacia.

• Atriplex patula - food plantlarval leaf mine host
• Atriplex prostrata - food plantlarval leaf mine host
• Atriplex littoralis - food plantlarval leaf mine host
• Atriplex hortensis - food plantlarval leaf mine host
• Atriplex hastata - food plantlarval leaf mine host
• Atriplex nitens - food plantlarval leaf mine host
• Atriplex sibirica - food plantlarval leaf mine host
• Atriplex cakotheca - food plantlarval leaf mine host
• Chenopodium album - food plantprimary larval host, leaf mines
• Chenopodium bonus-henricus - food plantlarval leaf mine host
• Chenopodium giganteum - food plantlarval leaf mine host
• Chenopodium glaucum - food plantlarval leaf mine host
• Chenopodium hybridum - food plantlarval leaf mine host
• Chenopodium murale - food plantlarval leaf mine host
• Chenopodium opulifolium - food plantlarval leaf mine host
• Chenopodium polyspermum - food plantlarval leaf mine host
• Chenopodium quinoa - food plantlarval leaf mine host
• Chenopodium urbicum - food plantlarval leaf mine host
• Chenopodium vulvaria - food plantlarval leaf mine host
• Amaranthus blitum - food plantlarval leaf mine host
• Amaranthus caudatus - food plantlarval leaf mine host
• Bassia scoparia - food plantlarval leaf mine host
• Spinacia - food plantlarval leaf mine host
• Pnigalio gyamiensis - parasitoidlarval-pupal ectoparasitoid; female paralyzes host larva
• Pnigalio soemius - parasitoidreared from this host
• Pnigalio cristatus - parasitoidreared from this host
• Pnigalio incompletus - parasitoidreared from this host
• Pnigalio agraules - parasitoidreared from this host

Two generations per year (bivoltine). Larval development occurs through four instars inside leaf mines, followed by pupation. In the Middle Volga region, first generation adults fly May–July, second generation August–September.

Larvae form contorted, gallery-style leaf mines on the surface of host plant leaves, with visible frass trails. When parasitized by Pnigalio gyamiensis, the host larva becomes paralyzed, loses mobility, stops feeding, and dies. The parasitoid female shows no significant preference for laying eggs on live versus dead host larvae.

Herbivore and leaf miner on weedy Amaranthaceae, particularly Chenopodium album. Serves as host for multiple Pnigalio parasitoid wasp species (P. gyamiensis, P. soemius, P. cristatus, P. incompletus, P. agraules), which may contribute to biological control of this and related herbivores.

Minor pest of spinach and quinoa cultivation. Presence in quinoa crops has been documented. Otherwise generally associated with weedy vegetation of limited agricultural concern.

• Other Chrysoesthia speciesSimilar size and metallic coloration; distinguished by precise configuration of forewing spots and host plant associations
• Other small Gelechiidae leaf minersSimilar mining habit; distinguished by host plant specificity and mine morphology (contorted gallery on Chenopodium/Atriplex surface)

• leaf miner
• bivoltine
• phytophagous
• Gelechiidae
• Amaranthaceae specialist

• BugGuide
• Wikipedia
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
• The preimaginal stages of Pnigalio gyamiensis Myartseva & Kurashev, 1990 (Hymenoptera, Eulophidae), a parasitoid associated with Chrysoesthia sexguttella (Thunberg) (Lepidoptera, Gelechiidae)