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Abstract
Cercospora species cause cercospora leaf blight (CLB) and purple seed stain (PSS) on soybean. Because there are few resistant soybean varieties available, CLB/PSS management relies heavily upon fungicide applications. Sensitivity of 62 Argentinian Cercospora isolates to demethylation inhibitor (DMI), methyl benzimidazole carbamate (MBC), quinone outside inhibitor (QoI), succinate dehydrogenase inhibitor (SDHI) fungicides, and mancozeb was determined in [ver mas...]
dc.contributor.authorSautua, Francisco José
dc.contributor.authorDoyle, Vinson P.
dc.contributor.authorPrice, Paul P.
dc.contributor.authorPorfiri, Alejandro
dc.contributor.authorFernandez, Paula Del Carmen
dc.contributor.authorScandiani, María Mercedes
dc.contributor.authorCarmona, Marcelo Anibal
dc.date.accessioned2022-01-14T11:19:52Z
dc.date.available2022-01-14T11:19:52Z
dc.date.issued2020-12
dc.identifier.issn0032-0862
dc.identifier.issn1365-3059
dc.identifier.otherhttps://doi.org/10.1111/ppa.13261
dc.identifier.urihttp://hdl.handle.net/20.500.12123/11121
dc.identifier.urihttps://bsppjournals.onlinelibrary.wiley.com/doi/abs/10.1111/ppa.13261
dc.description.abstractCercospora species cause cercospora leaf blight (CLB) and purple seed stain (PSS) on soybean. Because there are few resistant soybean varieties available, CLB/PSS management relies heavily upon fungicide applications. Sensitivity of 62 Argentinian Cercospora isolates to demethylation inhibitor (DMI), methyl benzimidazole carbamate (MBC), quinone outside inhibitor (QoI), succinate dehydrogenase inhibitor (SDHI) fungicides, and mancozeb was determined in this study. All isolates were sensitive to difenoconazole, epoxiconazole, prothioconazole, tebuconazole, and cyproconazole (EC50 values ranged from 0.006 to 2.4 µg/ml). In contrast, 51% of the tested isolates were sensitive (EC50 values ranged from 0.003 to 0.2 µg/ml), and 49% were highly resistant (EC50 > 100 µg/ml) to carbendazim. Interestingly, all isolates were completely resistant to azoxystrobin, trifloxystrobin, and pyraclostrobin, and insensitive to boscalid, fluxapyroxad, and pydiflumetofen (EC50 > 100 µg/ml). The G143A mutation was detected in 82% (53) of the QoI-resistant isolates and the E198A mutation in 97% (31) of the carbendazim-resistant isolates. No apparent resistance mutations were detected in the succinate dehydrogenase genes (subunits sdhB, sdhC, and sdhD). Mancozeb completely inhibited mycelial growth of the isolates evaluated at a concentration of 100 µg/ml. All Argentinian Cercospora isolates were sensitive to the DMI fungicides tested, but we report for the first time resistance to QoI and MBC fungicides. Mechanism(s) other than fungicide target-site modification may be responsible for resistance of Cercospora to QoI and MBC fungicides. Moreover, based on our results and on the recent introduction of SDHI fungicides on soybean in Argentina, Cercospora species causing CLB/PSS are insensitive (naturally resistant) to SDHI fungicides. Insensitivity must be confirmed under field conditions.eng
dc.formatapplication/pdfes_AR
dc.language.isoenges_AR
dc.publisherWileyes_AR
dc.rightsinfo:eu-repo/semantics/restrictedAccesses_AR
dc.sourcePlant Pathology 69 (9) : 1678-1694 (December 2020)es_AR
dc.subjectCercosporaes_AR
dc.subjectFungicidases_AR
dc.subjectFungicideseng
dc.subjectResistencia a los Fungicidases_AR
dc.subjectResistance to Fungicideseng
dc.subjectSojaes_AR
dc.subjectSoybeanseng
dc.subjectEnfermedades de las Plantases_AR
dc.subjectPlant Diseaseseng
dc.subjectArgentina
dc.titleFungicide resistance in Cercospora species causing cercospora leaf blight and purple seed stain of soybean in Argentinaes_AR
dc.typeinfo:ar-repo/semantics/artículoes_AR
dc.typeinfo:eu-repo/semantics/articlees_AR
dc.typeinfo:eu-repo/semantics/publishedVersiones_AR
dc.description.origenInstituto de Biotecnologíaes_AR
dc.description.filFil: Sautua, Francisco José. Universidad de Buenos Aires. Facultad de Agronomía. Cátedra de Fitopatología; Argentinaes_AR
dc.description.filFil: Doyle, Vinson P. LSU AgCenter. Department of Plant Pathology and Crop Physiology; Estados Unidoses_AR
dc.description.filFil: Price, Paul P. LSU AgCenter. Macon Ridge Research Station; Estados Unidoses_AR
dc.description.filFil: Porfiri, Alejandro. Consultor independiente; Argentinaes_AR
dc.description.filFil: Fernandez, Paula Del Carmen. Instituto Nacional de Tecnología Agropecuaria (INTA). Instituto de Agrobiotecnología y Biología Molecular; Argentina.es_AR
dc.description.filFil: Fernandez, Paula Del Carmen. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentinaes_AR
dc.description.filFil: Scandiani, María Mercedes. Universidad Nacional de Rosario. Facultad de Ciencias Bioquímicas y Farmacéuticas. Centro de Referencia de Micología (CEREMIC); Argentinaes_AR
dc.description.filFil: Carmona, Marcelo Anibal. Universidad de Buenos Aires. Facultad de Agronomía. Cátedra de Fitopatología; Argentinaes_AR
dc.subtypecientifico


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