Trichapion

Wagner, 1912

Species Guides

Trichapion is a of weevils in the Brentidae (formerly placed in Apionidae). The genus was established by Wagner in 1912. Several have been studied as agents, particularly for Sesbania weeds. Species were transferred from the genus Apion during taxonomic revisions.

Trichapion by (c) Emmett Collins-Sussman, some rights reserved (CC BY), uploaded by Emmett Collins-Sussman. Used under a CC-BY license.

Proceedings of the United States National Museum (1960) (14779593724) by Internet Archive Book Images. Used under a No restrictions license.

Proceedings of the United States National Museum (1960) (14778801511) by Internet Archive Book Images. Used under a No restrictions license.

Pronunciation

How to pronounce Trichapion: /tɹɪˈkæpiˌɑn/

These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.

Identification

Distinguished from the related Apion by structural features of the rostrum and ; exact diagnostic characters require examination. Formerly classified within Apion, now separated based on morphological differences.

Images

Habitat

Associated with plants in the Sesbania (Fabaceae); specific requirements vary by .

Distribution

Records from Colombia (CO) and Argentina; broader distribution unclear. At least one , Trichapion lativentre, has been introduced to South Africa for .

Host Associations

Sesbania punicea - Primary for Trichapion lativentre; used in programs
Sesbania exaltata - tested Evaluated for suitability for T. lativentre in Argentina
Sesbania drummondii - tested Evaluated for suitability for T. lativentre in Argentina

Behavior

Trichapion lativentre has been observed to suppress growth and of its plant Sesbania punicea; abundance correlates with effectiveness of weed suppression.

Ecological Role

agent for Sesbania weeds; abundance directly affects suppression of plant growth and seed production.

Human Relevance

Used in programs against Sesbania , particularly in South Africa. specificity testing conducted to evaluate safety for non-target plants.

Similar Taxa

ApionFormerly included in Apion; separated based on rostrum and antennal . Historical literature may use Apion for Trichapion .
Neodiplogrammus quadrivittatusCo-occurs in suitability studies on Sesbania ; both evaluated as potential agents.

Misconceptions

Frequently misidentified or historically classified under Apion; literature prior to taxonomic revision may not distinguish Trichapion as separate .

More Details

Taxonomic history

now placed in Trichapion were formerly included in Apion. placement has also shifted, with some sources listing Apionidae and others Brentidae (Apioninae as ). NCBI currently lists Apionidae; GBIF and iNaturalist list Brentidae.

Biological control research

Trichapion lativentre has been the most studied , with research focused on its effectiveness against Sesbania punicea in South Africa and range testing on North American Sesbania species in Argentina.