Agapeta zoegana

Bright yellow forewings with distinct brown terminal blotch and costal markings; dark grey hindwings. Distinguished from similar tortricids by the combination of yellow ground color with ferruginous-fuscous patterning and association with knapweed hosts. Z-11-tetradecenyl acetate is a documented sex attractant for monitoring.

Adults are bright yellow with brown markings. Forewings have a moderately arched costa, with the costal edge, a small subdorsal spot before the middle, and a large terminal blotch with angulated edge in ferruginous-fuscous brown. Hindwings are dark grey. Body length approximately 11 mm.

Open, disturbed habitats supporting knapweed populations. In native range, occurs in areas with Centaurea species. In introduced range, established in spotted and diffuse knapweed infestations in western and west-central North America. Larval habitat is within the root crown and root cortex of host plants.

Native to Eurasia, widely distributed across central and southeastern Europe including eastern Austria, northwestern Hungary, central Hungary, and Alsace region. Introduced to North America starting in 1980s; established in western and west-central United States and southwestern Canada (British Columbia since 1984).

Adult flight from May to August, with peak emergence varying by cohort and release density. Emergence occurs from dusk and adults are attracted to light. Overwinters as larva in host root.

Larva feeds on root tissues: early instars mine epidermal tissues of the root crown; older instars tunnel through root cortex and endodermis. Host plants are restricted to Centaurea species, particularly spotted knapweed (Centaurea maculosa) and diffuse knapweed (C. diffusa).

• Centaurea maculosa - primary hosttetraploid North American form is main target for biocontrol
• Centaurea diffusa - primary hostdiploid; established on in British Columbia since 1984
• Centaurea vallesiaca - hostdocumented in European literature

Egg laid on stems and leaves. Larva mines root crown epidermis, then moves to root and tunnels through cortex; can migrate below ground to new host if initial plant destroyed. Overwinters as larva within root. Pupation occurs in root; adult emergence June through August. Several generations per year may occur. Adult lives only a few days.

Adults fly from dusk and are attracted to light. Larvae exhibit active searching ability and can migrate underground to locate new host plants when initial host is destroyed. Under high larval densities, earlier pupation and emergence may occur, possibly due to resource depletion or crowding.

Root herbivore and biological control agent for invasive knapweeds. Reduces knapweed spread in areas where mechanical and chemical control is impractical. Predominantly attacks rosette stage, which is the most sensitive stage for knapweed population dynamics. Compatible with other knapweed biocontrol agents including Pelochrista medullana and seed-feeding species.

Intentionally introduced to North America for classical biological control of noxious knapweeds. Approved for release in Canada and USA. Monitored using synthetic sex attractant (Z-11-tetradecenyl acetate). Reduces knapweed density below economic threshold in rangeland and pasture systems.

• Pelochrista medullanaAnother knapweed root-feeding moth in family Tortricidae; co-occurs in biocontrol programs but distinguished by different morphology and life history
• Other Cochylidae/TortricidaeAgapeta zoegana distinguished by bright yellow coloration with brown terminal blotch, specific host association with Centaurea, and documented sex pheromone chemistry

• biological control
• root miner
• knapweed
• invasive species management
• sex pheromone
• multivoltine

• BugGuide
• Wikipedia
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
• BIOLOGY OF AGAPETA ZOEGANA (LEPIDOPTERA: COCHYLIDAE), PROPAGATED FOR THE BIOLOGICAL CONTROL OF KNAPWEEDS (ASTERACEAE)
• FIRST REPORT OF THE ESTABLISHMENT OF AGAPETA ZOEGANA L. (LEPIDOPTERA: COCHYLIDAE) ON SPOTTED KNAPWEED, CENTAUREA MACULOSA LAMARCK, IN THE UNITED STATES
• Z-11-TETRADECENYL ACETATE: SEX ATTRACTANT OF AGAPETA ZOEGANA (LEPIDOPTERA: TORTRICIDAE), A POTENTIAL SPECIES FOR THE BIOLOGICAL CONTROL OF KNAPWEED
• Growth pattern of diploid and tetraploid spotted knapweed, Centaurea maculosa Lam. (Compositae), and effects of the root‐mining moth Agapeta zoegana (L.) (Lep.: Cochylidae)
• AGAPETA ZOEGANA (L.) (LEPIDOPTERA: COCHYLIDAE), A SUITABLE PROSPECT FOR BIOLOGICAL CONTROL OF SPOTTED AND DIFFUSE KNAPWEED, CENTAUREA MACULOSA MONNET DE LA MARCK AND CENTAUREA DIFFUSA MONNET DE LA MARCK (COMPOSITAE) IN NORTH AMERICA