First report of<i>Phytophthora capsici</i>on cucurbits and peppers in British Columbia
Bibliographic record
Abstract
Phytophthora capsici is a devastating pathogen of several commercial cucurbit and solanaceous crops. In August 2004, P. capsici was isolated and identified for the first time in British Columbia from an infected pumpkin (Cucurbita pepo var. medullosa) purchased from a market garden in Kelowna. Visual symptoms of fruit rot were also evident on several varieties of squash (Cucurbita spp.), pepper (Capsicum annuum), and eggplant (Solanum melongena var. esculentum) from the same area. Further characterization of the causal agent was needed to confirm its identification, pathogenicity, and ability to overwinter. Eight isolates obtained from infected pumpkin and from five different squash varieties grew on selective media for P. capsici. Single-spore isolates were produced from these cultures, and DNA was extracted from them. On the basis of sequence analysis, the eight isolates were P. capsici, differing by two or fewer nucleotides in the ribosomal spacer (internal transcribed spacer 2 (ITS2)) regions compared with previously identified strains. In pathogenicity studies, isolates 2256 and 2289, originally from butternut squash (Cucurbita moschata) and pumpkin, respectively, infected sweet pepper (Capsicum annuum var. frutescens) and butternut squash, killing pepper plants in 8 days. The isolates were less pathogenic on squash, according to the area under the disease progress curve, which was approximately six times higher in pepper than squash. Phytophthora capsici was recovered from both sweet pepper and butternut squash, as well as from infected zucchini (Cucurbita pepo var. melopepo) and watermelon (Citrullus lanatus) plants. Mating studies showed that isolates 2256 and 2289 were probably the A1 mating type because they produced oospores only if they were paired with the A2 tester strain obtained from the Centraalbureau voor Schimmelcultures culture collection. A hypothesis on how the disease developed and spread in British Columbia is presented.
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 | 0.001 | 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) | 0.000 | 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 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".