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Record W2117772970 · doi:10.1080/07060660809507551

Physical control of powdery mildew (<i>Oidium neolycopersici</i>) on tomato leaves by exposure to corona discharge

2008· article· en· W2117772970 on OpenAlex

Why this work is in the frame

A frame that forgets how it found something cannot be audited. These are the routes that admitted this work.

venuePublished in a venue whose home country is Canada.
no affNo Canadian affiliation: this work is invisible to an affiliation-only frame.
No Canadian affiliation. An affiliation-only frame, the usual design, would never have seen this work. It is one of the works that make the case for inverting the frame.

Bibliographic record

VenueCanadian Journal of Plant Pathology · 2008
Typearticle
Languageen
FieldAgricultural and Biological Sciences
TopicPowdery Mildew Fungal Diseases
Canadian institutionsnot available
Fundersnot available
KeywordsPowdery mildewHorticultureMaterials scienceElectric arcBotanyComposite materialChemistryBiologyElectrode

Abstract

fetched live from OpenAlex

Abstract We devised a cylindrical electrostatic discharge generator to physically eradicate tomato powdery mildew colonizing tomato leaves. The generator consists of a copper needle with a pointed tip, an insulating acrylic cylinder, and an electrostatic voltage generator. The needle is insulated with a vinyl sleeve, except for the pointed tip, and is coaxially fixed in the cylinder and connected to the voltage generator. The needle is negatively charged, and the treated plant is earthed. In initial tests, a corona, characterized by a blue glow, formed at the needle tip as the probe was brought closer to the leaf surface. The distance at which this occurred increased from 16 to 50 mm as the voltage was increased from 5 to 30 kV. If the probe was brought too close to the leaf surface, an arc discharge occurred that caused injury to the leaf. Powdery mildew colonies were destroyed by 2-second exposures at probe distances intermediate to where corona discharge was initiated and where arcing occurred. A probe distance of 25 mm and 30 kV for a 2-second burst was selected to further test the efficacy of the probe for controlling powdery mildew in a greenhouse environment. Tomato plants were grown hydroponically in two open-window greenhouses under a first-truss cropping system. Colonies appeared on tomato leaves 10 to 14 days after transplanting. During the following 2 weeks, these colonies produced abundant progeny conidia that secondarily infected neighboring plants. Corona discharge treatment in one greenhouse, at the stage when colonies first became visible, completely suppressed the spread of the disease compared with a non-treated greenhouse in which disease spread rapidly. The present discharge generator is portable and easy to operate on-site as a part of routine care of hydroponically cultured tomatoes in greenhouses and provides a non-chemical method to control powdery mildew disease. Key words: disease control, tomato powdery mildew, electrostatic field, single-truss cropping. Nous avons conçu un générateur cylindrique de décharges électrostatiques pour éradiquer physiquement l'oïdium colonisant les feuilles de la tomate. Le générateur est composé d'une aiguille de cuivre pointue à une extrémité, d'un cylindre isolant d'acrylique et d'un générateur de voltage électrostatique. L'aiguille, sauf sa pointe, est isolée à l'aide d'un manchon de vinyle et est fixée coaxialement dans le cylindre et branchée au générateur. L'aiguille est chargée négativement et la plante est reliée à la terre. Lors des tests initiaux, un effluve, caractérisé par une lueur bleue, s'est formé à la pointe de l'aiguille lorsqu'on approcha la sonde de la surface d'une feuille. La distance à laquelle ceci s'est produit a augmenté de 16 à 50 mm quand le voltage a été augmenté de 5 à 30 kV. Si l'on approchait la sonde trop près de la surface de la feuille, il se produisait une décharge en arc qui blessait la feuille. Deux secondes d'exposition suffisaient pour détruire les colonies d'oïdium lorsque la distance à la feuille se situait environ à mi-chemin entre celle permettant la formation de l'effluve et celle à laquelle se produisait la décharge en arc. Une distance de la sonde à la surface de la feuille de 25 mm et une tension de 30 kV appliquée pendant 2 secondes ont été choisies pour vérifier, en serre, encore davantage l'efficacité de la sonde et du traitement. Les tomates étaient produites en culture hydroponique dans deux serres ouvertes, selon la méthode de la grappe unique. Les colonies sont apparues sur les feuilles des tomates de 10 à 14 jours après la transplantation. Dans le cours des deux semaines suivantes, les colonies produisirent d'abondantes conidies qui infectèrent les plantes avoisinantes (infection secondaire). Dans une des serres, le traitement à l'effluve, au stade o[ugrave] les colonies ont commencé à paraître, inhiba complètement la propagation de la maladie, comparé à l'autre serre o[ugrave] la maladie se propagea rapidement. Le générateur de décharges électrostatiques est portable et facile à utiliser. Son utilisation trouve facilement sa place parmi les soins de routine donnés aux tomates cultivées en serres hydroponiques et pourvoit un moyen de lutte non chimique contre l'oïdium. Mots-clés : lutte contre les maladies, oïdium, champ électrostatique, méthode de la grappe unique.

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.

Full frame distilled prediction

Teacher imitation

Not 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.

metaresearch head score (Codex)0.000
metaresearch head score (Gemma)0.000
Version: codex-gemma-dda1882f352aValidation status: machine_predicted_unvalidated
Candidate categoriesnone
Consensus categoriesnone
DomainCandidate signal: none · Consensus signal: none
Study designCandidate signal: Observational · Consensus signal: none
GenreCandidate signal: Empirical · Consensus signal: Empirical
Teacher disagreement score0.830
Threshold uncertainty score0.337

Codex and Gemma teacher scores by category

CategoryCodexGemma
Metaresearch0.0000.000
Meta-epidemiology (narrow)0.0000.000
Meta-epidemiology (broad)0.0000.000
Bibliometrics0.0000.000
Science and technology studies0.0000.000
Scholarly communication0.0000.000
Open science0.0000.000
Research integrity0.0000.000
Insufficient payload (model declined to judge)0.0000.000

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.

Opus teacher head0.011
GPT teacher head0.183
Teacher spread0.172 · how far apart the two teachers sit on this one work
Validation statusscore_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it