Onion leaf blight caused by <i>Alternaria alternata sensu lato</i> and <i>Stemphylium vesicarium</i> in Michoacán, México
Bibliographic record
Abstract
México is among the main producers of onions, which are cultivated mainly in the states of Baja California, Chihuahua, Guanajuato, Michoacán, and Zacatecas. During June and November 2017, foliar blight symptoms were observed in commercial onion crops in the municipality of Copándaro, Michoacán. The incidence of the disease was 20% in June and 80% in November. The objective of this work was to identify the causal agent or agents of this disease. Fungal isolates recovered from symptomatic plants presented conidia typical of Alternaria and Stemphylium. Molecular identification and phylogenetic analysis using partial sequences of the nuclear ribosomal internal transcribed spacer (ITS) region, the translation elongation factor-1 alpha (TEF1), and RNA polymerase subunit II (RPB2) genes confirmed the identity of the isolates as species within the Alternaria alternata species complex, and Stemphylium vesicarium. The isolates reproduced foliar blight symptoms in inoculated onion plants in pathogenicity tests. This is the first report of Alternaria alternata sensu lato and Stemphylium vesicarium causing foliar blight in commercial onion crops in Michoacán.
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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 | 0.000 |
| 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) | 0.000 | 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".