Agonoscelis

Spinola, 1837

Agonoscelis is a of () in the tribe Agonoscelidini. The genus contains approximately 19–22 to the Afrotropics and Australia, with one species, A. puberula, established in the New World. Several species are agricultural pests of sorghum, sunflower, and other . range from 8 to 12 mm in length and possess five nymphal stages.

Agonoscelis by (c) prossington, some rights reserved (CC BY). Used under a CC-BY license.Agonoscelis by (c) prossington, some rights reserved (CC BY). Used under a CC-BY license.Agonoscelis puberula by (c) Catherine C. Galley, some rights reserved (CC BY), uploaded by Catherine C. Galley. Used under a CC-BY license.

Pronunciation

How to pronounce Agonoscelis: //ˌæɡəˈnɒsɪlɪs//

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Habitat

Agricultural fields, particularly sorghum production areas; specific tree serve as preferred resting and sheltering sites where individuals aggregate with other .

Distribution

to the Afrotropics and Australia; one (A. puberula) is established in the New World, with the oldest record from Cuba dating to 1978. Within Africa, documented in Sudan (Gedarif, Nile, North Darfur, Sennar States), Botswana, Namibia, South Africa, Zambia, and Angola.

Diet

Developing seeds of sorghum (millet), sunflower, and cereals; also feeds on herbs including horehound and thyme, and has been observed on flax, cotton, coffee, and cacao. Specific feeding damage occurs at the milky stage of grain development.

Host Associations

  • Sorghum - pestprimary ; causes severe in Sudan
  • Helianthus annuus (sunflower) - pestdeveloping seeds
  • Marrubium vulgare (horehound) - pestA. rutila specific association
  • Thymus - pestherb feeding
  • Linum (flax) - pestherb feeding
  • Gossypium (cotton) - pestherb feeding
  • Coffea (coffee) - associationswarming observed
  • Theobroma cacao (cacao) - associationswarming observed

Life Cycle

Five nymphal stages precede adulthood. No further details on developmental timing or reproductive biology are documented.

Behavior

Aggregates at specific resting sites, particularly certain tree ; forms mixed- with other at sheltering locations. Exhibits roosting that facilitates targeted control efforts.

Ecological Role

Agricultural pest causing severe to sorghum production in Sudan; some may contribute to weed control. Serves as for associated at sheltering sites.

Human Relevance

Major pest of sorghum (Dura) in Sudan requiring chemical control campaigns; target of research using (, sunflower, sesame) as alternatives to synthetic . One to Cuba, possibly via military transport from Angola during Cold War conflicts.

Similar Taxa

  • Carbula pedalisCo-occurs in Sudan sorghum areas but shelters in mountain caves rather than trees; distinct resting site preference and associated
  • Nezara viridulaBoth are agricultural pests, but Agonoscelis are distinguished by Afrotropical/Australian range and specific association with sorghum and sunflower seed feeding

More Details

Tribe monotypy

Agonoscelis is the sole in the tribe Agonoscelidini, indicating a distinct phylogenetic lineage within Pentatominae.

Scent gland position

The defensive is located terminally at the end of the , a trait noted for the .

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Sources and further reading