Ecology and control of the soybean aphid, Aphis glycines Matsumura (Homoptera: Aphididae)
Bibliographic record
Abstract
The soybean aphid, 'Aphis glycines' Matsumura (Homoptera: Aphididae) is an important pest affecting soybean. Populations cycle between a secondary summer host, where reproduction occurs by parthenogenesis and a primary host, where populations overwinter as eggs. In North America, primary hosts include 'R. cathartica' L. (European buckthorn) and the native species, 'Rhamnus alnifolia' L'Heritier and ' R. lanceolata' Pursh; the principal secondary host in North America is soybean, 'Glycine max' (L.) Merr. The consequences of host alternation are of particular importance in the management of the soybean aphid. Firstly, population dynamics on both hosts may be at least partially interdependent. Host alternation may also affect the nature and extent of interactions occurring among the soybean aphid and its natural enemies on both hosts. This thesis explores aspects of the ecology and control of the soybean aphid on the secondary host, 'G. max' and the primary host, 'R. cathartica.' This research had the following objectives: (i) to examine overwintering dynamics of egg populations on ' R. cathartica,' (ii) to describe the behaviour of a biological control agent, the parasitoid 'Aphidius colemani' Viereck (Hymenoptera: Braconidae), with respect to host-plant preferences and a common coccinellid predator of the soybean aphid; 'Harmonia axyridis ' Pallas, (iii) to assess the efficacy of two neonicotinoid insecticides, thiamethoxam and imidacloprid, for control of soybean aphid and (iv) to evaluate parasitism by 'A. colemani' on soybean aphid populations reared on plants treated with neonicotinoid insecticides. The implications of this work for soybean aphid control in Ontario are discussed and recommendations for future research are made.
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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 | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 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".