Characterization and pathogenicity of <i>Rhizoctonia</i> spp. from field crops in Canada
Bibliographic record
Abstract
A survey for the presence of <i>Rhizoctonia</i> species on barley, bean, canola, corn, pea, soybean and wheat in 170 fields in Canada was completed during 2009–2011. <i>Rhizoctonia solani</i> was recovered from 52 (31%) of the 170 fields surveyed. A total of 191 isolates of <i>R. solani</i> belonging to anastomosis groups (AG) AG 2-1, AG 2-2, AG 4, AG 5, AG 9 and AG 11 were recovered. Fifty-two binucleate isolates of <i>Rhizoctonia</i> spp. were also recovered from 35 (21%) of the crops surveyed. In growth room pathogenicity studies, isolates belonging to AG 2-1 were pathogenic primarily on canola while isolates of other anastomosis groups tended to have wider host ranges. Symptoms included pre- and post-emergence damping off, crown rot and, to a lesser extent, root rot. The majority of binucleate isolates were not pathogenic or only had low aggressiveness on the hosts tested. There was considerable variation in host range among isolates of <i>R. solani</i> within individual AGs, and isolates recovered from asymptomatic seedlings of some hosts were pathogenic to other hosts often used in the same rotation. Collectively, the results are important for documenting the widespread occurrence of <i>R. solani</i> in seedlings of field crops in Canada, for characterizing variation in AGs and host range, and for identifying effective crop sequences used in crop rotations.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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) | 0.027 | 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".