Biocontrol Agents Cross Borders: First Detection of the Knapweed Seed Head Weevil, Bangasternus fausti (Reitter) (Coleoptera: Curculionidae), in Canada
Bibliographic record
Abstract
The Palearctic seed head-feeding weevils Bangasternus fausti (Reitter) and Bangasternus orientalis (Capiomont) were first introduced into the western United States for the biological control of invasive Centaurea L. (Asteraceae) species in the late 1980s. Although neither Bangasternus Gozis species has been intentionally introduced in Canada, observations of adult weevils matching the description of Bangasternus were reported on Centaurea diffusa Lam. in the southern interior of British Columbia, Canada via iNaturalist.org during 2019 and 2020. We searched for Bangasternus individuals on Centaurea species throughout southern British Columbia and adjacent parts of Washington state, USA between 2020 and 2022. Using a combination of morphological characters, molecular diagnostics, and host-plant association, we report a new country record of B. fausti (sensu Colonnelli and Whitehead 1990) in Canada. Given that B. fausti is now established in select areas of southern British Columbia, we discuss its potential role in providing suppression of C. diffusa and its possible interactions with the existing seed head-feeding biocontrol agent community.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.003 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".