First report of Phacidiopycnis rot of pears caused by <i>Potebniamyces pyri</i> (anamorph <i>Phacidiopycnis piri</i> ) in British Columbia
Bibliographic record
Abstract
Potebniamyces pyri (anamorph Phacidiopycnis piri) causes a postharvest disease known as Phacidiopycnis rot primarily in stored winter pears and canker and twig dieback of apple and pear trees. Although Phacidiopycnis rot is known to occur in the bordering state of Washington, USA, it has not been reported in British Columbia (BC), Canada. Information was needed to determine if the disease occurred in BC and if it was as serious a problem on ‘d'Anjou’ winter pears as reported in Washington State. Surveys of stored BC pears, primarily ‘d'Anjou’, conducted in 2006 and 2007 showed that 39 and 26.5% of the culled fruit, respectively, were infected by P. pyri. The only other pathogen to cause similar amounts of decay was Botrytis cinerea. In order to confirm identification of this pathogen, single spore isolates were obtained from infected fruit and DNA was extracted from these isolates. Based on symptoms, colony and spore characteristics, and sequence analysis of both the ITS and β-tubulin regions, the BC isolates were shown to be the same fungal species as the Washington State isolates previously identified as P. pyri. Furthermore, the isolates were shown to be as pathogenic on ‘d'Anjou’ pear fruit as were Washington State isolates. Field studies from established pear orchards showed that the fungus infected ‘d'Anjou’ pear trees in BC orchards causing cankers and branch dieback. Some possible methods of controlling this pathogen are discussed.
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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 | 0.001 |
| Science and technology studies | 0.002 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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".