Distribution and parasitism rate of cabbage seedpod weevil parasitoids over almost a decade in Quebec (Canada)
Bibliographic record
Abstract
The cabbage seedpod weevil (CSW), a pest of oilseed rape crops, was first detected in the Province of Quebec (Canada) in canola in 2000. The parasitoid wasp Trichomalus perfectus is the main biological control agent of the CSW in Europe. However, its efficiency as well as its distribution across the province of Quebec are poorly known. We investigated CSW damage in canola fields, along with the abundance and parasitism rates of all its parasitoids , as well as that of T. perfectus alone, in Quebec from 2012 to 2020. This study highlighted that the CSW is well established in Quebec (82% of canola fields sampled), especially in the regions of Bas-Saint-Laurent, Chaudière-Appalaches, and Capitale-Nationale. Only three fields exceeded the threshold of 25% damaged pods, and only in 2019. Parasitoids of CSW were present in 62% of canola fields. Their distribution follows that of the CSW and their populations were primarily composed of Pteromalidae (95.7% of the individuals) among which T. perfectus was the main species with almost 80% of the individuals. The mean parasitism rate from 2012 to 2020 was 43.1% and that of T. perfectus was 26.1%. Seed damage was reduced by 47% on average when CSW larvae were parasitized. Parasitoids, particularly T. perfectus due to its higher abundance compared to other parasitoid species and its significant contribution to the overall parasitism rate, play a key role in controlling CSW populations in Quebec, helping to keep them below the economic damage threshold.
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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 | 0.002 | 0.002 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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".