Ascospore gradients of <i>Gibberella zeae</i> from overwintered inoculum in wheat fields
Bibliographic record
Abstract
Ascospore gradients of Gibberella zeae, causal agent of fusarium head blight of wheat, were measured over a 3-month period in 1999 at two sites in Quebec, Canada: Macdonald Campus (MAC), McGill University, Sainte-Anne-de-Bellevue, and L'Acadie Experimental Farm (LAC), Agriculture and Agri-food Canada, L'Acadie. Spores were sampled daily with rotorod-type samplers along transects at intervals of 10 m up to 50 m away from plots of wheat inoculated at anthesis the previous summer and allowed to overwinter. At MAC, ascospore concentrations > 100 m3 were detected on 38 nights from 1 June to 20 August, in 16 separate release events that lasted from 1 to 3 nights. Most of the ascospore releases occurred 16 days after an initiating rainfall, and the ascospore concentration decreased over time in evenings subsequent to the initiating rainfall. Spore gradients were modeled with the inverse-power model of Gregory, the negative exponential model of Kiyosawa and Shiyomi, and the general model of Lambert. The general model outperformed the other two models at both sites, with an adjusted R 2 = 0.88 and 0.79 for MAC and LAC, respectively. The inverse-power model outperformed the negative exponential model at MAC, and vice versa at LAC. Based on gradients that fit the negative exponential model, ascospore concentrations declined by 50% within 18 m of the source, and by 90% within 60 m of the source at MAC. This is the first detailed study of ascospore gradients of G. zeae from naturally overwintered inoculum on a field scale. Although ascospore concentrations declined considerably within the 50-m transect, long-distance transport of spores beyond the field may occur.Key words: ascospore gradients, fusarium head blight, Triticum aestivum, Gibberella zeae, Fusarium graminearum.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| 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 teacher head, 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".