Comparison of Current Peanut Fungicides Against Athelia rolfsii Through a Laboratory Bioassay of Detached Plant Tissues

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dc.contributor.authorWei, Xingen
dc.contributor.authorLangston, David B.en
dc.contributor.authorMehl, Hillary L.en
dc.date.accessioned2023-05-25T19:07:39Zen
dc.date.available2023-05-25T19:07:39Zen
dc.date.issued2022-08en
dc.description.abstractSouthern stem rot of peanut, caused by Athelia rolfsii, is an important fungal disease that impacts peanut production worldwide. Foliar-applied fungicides are used to manage the disease, and several fungicides have been recently registered for southern stem rot control in peanuts. This study compared fungicidal, residual, and potential systemic activity of current fungicides against A. rolfsii using a laboratory bioassay. Peanut plants grown in the field were treated with eight fungicides approximately 90 days after planting, and plants were collected for the laboratory bioassay weekly for 5 weeks following application. Peanut plants were separated into the newest fully mature leaf present at sample collection, the second newest fully mature leaf present at the time of fungicide application, the upper stem, and the crown tissues. Each plant tissue was inoculated with A. rolfsii then incubated at 30 degrees C for 2 days. Lesion length was measured, and percent inhibition of fungal growth by each fungicide relative to the control was calculated. All fungicides provided the greatest inhibition of A. rolfsii on leaf tissues that were present at the time of fungicide application, followed by the newly grown leaf and upper stem. Little inhibition occurred on the crown. Fungal inhibition decreased at similar rates over time for all fungicides tested. Succinate dehydrogenase inhibitors provided less basipetal protection of upper stems than quinone outside inhibitor or demethylation inhibitor fungicides. Properties of the fungicides characterized in this study, including several newly registered products, are useful for developing fungicide application recommendations to maximize their efficacy in controlling both foliar and soilborne peanut diseases.en
dc.description.adminPublic domain – authored by a U.S. government employeeen
dc.description.notesThis work was funded by the Virginia Peanut Board.en
dc.description.sponsorshipVirginia Peanut Boarden
dc.description.versionPublished versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.doihttps://doi.org/10.1094/PDIS-12-21-2789-REen
dc.identifier.eissn1943-7692en
dc.identifier.issn0191-2917en
dc.identifier.issue8en
dc.identifier.pmid35306840en
dc.identifier.urihttp://hdl.handle.net/10919/115193en
dc.identifier.volume106en
dc.language.isoenen
dc.publisherAmerican Phytopathological Societyen
dc.rightsPublic Domain (U.S.)en
dc.rights.urihttp://creativecommons.org/publicdomain/mark/1.0/en
dc.subjectArachis hypogaeaen
dc.subjectdemethylation inhibitor (DMI)en
dc.subjectfungal inhibitionen
dc.subjectquinone outside inhibitor (QoI)en
dc.subjectresidual activityen
dc.subjectSclerotium rolfsiien
dc.subjectsouthern stem roten
dc.subjectsuccinate dehydrogenase inhibitor (SDHI)en
dc.titleComparison of Current Peanut Fungicides Against Athelia rolfsii Through a Laboratory Bioassay of Detached Plant Tissuesen
dc.title.serialPlant Diseaseen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten

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