Natural History of Plutella armoraciae Busck, 1912, A Sympatric Congener of the Diamondback Moth, Plutella xylostella (L., 1758), in Southwestern Canada
Bibliographic record
Abstract
The basic biology, seasonal ecology, and hymenopteran parasitoid community of Plutella armoraciae Busck, 1912 (Lepidoptera: Plutellidae) was investigated. The study area was a dry grasslands region of interior British Columbia, Canada, where P. armoraciae feeds on the introduced mustard Sisymbrium loeselii L., 1755 (Brassicaceae) in partial sympatry with its congener, the diamondback moth Plutella xylostella (L., 1758) (Lepidoptera: Plutellidae). Sampling was conducted over five years, including one year of repeated, intensive sampling over a large region. The two Plutella species can be differentiated with morphology alone and we provide comparisons of features of the eggs, larvae, pupae and adults of each species. Plutella armoraciae was found to overwinter as eggs or early-instar larvae in S. loeselii rosettes, with adults emerging in April and May, and the first full generation each year taking place in May and June. Larvae fed within webbed flowers and buds of S. loeselii plants, giving rise to a second autumn generation of adults that laid eggs of the overwintering generation. The early summer generation of P. armoraciae larvae peaked earlier than, but partially overlapped with, the peak occurrence of P. xylostella larvae. Both Plutella species were relatively common across all surveyed sites, but not highly abundant at any site. At least two species of larval parasitoids, Diadegma insulare (Cresson) (Hymenoptera: Ichneumonidae) and Diolcogaster claritibia (Papp) (Hymenoptera: Braconidae), were shared between the two Plutella species, and a community of eight other species of parasitoids and hyperparasitoids were reared from the pupae of one or both Plutella species. The observations of D. claritibia emerging from P. armoraciae are the first records of this parasitoid from a host species other than P. xylostella. It was also discovered that one of the most important parasitoids of P. xylostella worldwide, D. insulare, appears to use P. armoraciae as an overwintering host. We hypothesize that in areas where P. xylostella is a seasonal migrant, year-round resident Plutella species such as P. armoraciae could provide important overwintering hosts and reservoirs for shared parasitoids that help to reduce populations of P. xylostella.
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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 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| 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".