Races of<i>Puccinia graminis</i>on wheat, barley, and oat in Canada, in 2002 and 2003
Bibliographic record
Abstract
Annual surveys of stem rust [Puccinia graminis] are conducted on cereals in Canada to provide information on virulence dynamics in the pathogen population. Wheat, barley, and oat samples were collected in Manitoba, Saskatchewan, Alberta, and Ontario in 2002 and 2003. Stem rust was absent on commercial wheat cultivars in either year. In 2002, stem rust on commercial barley cultivars ranged from trace to 7% severity in Manitoba and, in 2003, was at trace levels across the prairie region. In 2002, stem rust on commercial oat cultivars was heaviest (5%–50% severity) in eastern Manitoba and progressively diminished to trace levels in eastern Saskatchewan. In 2003, stem rust on oat was at trace levels across the prairie region. Eleven races of Puccinia graminis f. sp. tritici were found in trap plots of susceptible wheat, 8 on commercial barley, and 14 on wild barley. The predominant races on wheat and wild barley were RCRSK, QCCJN, and RCCJN in 2002, and QFCSR and QFCSH in 2003. The predominant races on commercial barley were QCCJ- and RCCJ-types, which are virulent against resistance gene Rpg1. Eight races of Puccinia graminis f. sp. avenae were found on commercial oat, and seven on wild oat. The predominant races on commercial oat were NA67 and NA29 (63.4% and 14.4%) in 2002, and NA67 and NA76 (77.8% and 10.4%) in 2003. NA67 and NA29 were also predominant on wild oat in 2002 (43.2% and 24.9%) and in 2003 (53.8% and 22.7%). Race NA28, which is virulent to resistance gene Pg-a and last reported in 1997, was found at two locations in Manitoba in 2003.
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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) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.003 |
| Science and technology studies | 0.002 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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".