Conyza bonariensis' resistance to glyphosate, diclosulam, and chlorimuron: confirmation and alternative control for the first case of multiple and cross-resistance in Uruguay.
ABSTRACT.- Conyza bonariensis L. (hairy fleabane) is a significant weed in production systems, especially due to its evolving resistance to various herbicides. In Uruguay, control failures of C. bonariensis have been reported following the use of glyphosate and ALS inhibitors. The objective of this...
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| Language: | English |
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2024
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| Online Access: | https://ainfo.inia.uy/consulta/busca?b=pc&id=64480&biblioteca=vazio&busca=64480&qFacets=64480 |
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| _version_ | 1868890044204318720 |
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| author | KASPARY, T. E. |
| author2 | WALLER, M.E. GARCIA, A. CABRERA, M. HILL, S.M. |
| author2_role | author author author author |
| author_browse | CABRERA, M. GARCIA, A. HILL, S.M. KASPARY, T. E. WALLER, M.E. |
| author_facet | KASPARY, T. E. WALLER, M.E. GARCIA, A. CABRERA, M. HILL, S.M. |
| author_role | author |
| collection | AINFO |
| dc.creator.none.fl_str_mv | KASPARY, T. E. WALLER, M.E. GARCIA, A. CABRERA, M. HILL, S.M. |
| dc.date.none.fl_str_mv | 2024 2025-06-23T18:36:46Z 2025-06-23T18:36:46Z 2025-06-23T18:36:46Z |
| dc.identifier.none.fl_str_mv | https://ainfo.inia.uy/consulta/busca?b=pc&id=64480&biblioteca=vazio&busca=64480&qFacets=64480 |
| dc.language.none.fl_str_mv | en eng |
| dc.rights.none.fl_str_mv | info:eu-repo/semantics/openAccess Acceso abierto |
| dc.source.none.fl_str_mv | reponame:AINFO instname:Instituto Nacional de Investigación Agropecuaria instacron:Instituto Nacional de Investigación Agropecuaria |
| dc.subject.none.fl_str_mv | ALS inhibitors EPSPS inhibitor Hairy fleabane Herbicide resistance South America Weeds ÁREA DE PASTURAS Y FORRAJES - INIA. |
| dc.title.none.fl_str_mv | Conyza bonariensis' resistance to glyphosate, diclosulam, and chlorimuron: confirmation and alternative control for the first case of multiple and cross-resistance in Uruguay. |
| dc.type.none.fl_str_mv | Article PublishedVersion info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion |
| description | ABSTRACT.- Conyza bonariensis L. (hairy fleabane) is a significant weed in production systems, especially due to its evolving resistance to various herbicides. In Uruguay, control failures of C. bonariensis have been reported following the use of glyphosate and ALS inhibitors. The objective of this study was to investigate the occurrence of the multiple and cross-resistance of C. bonariensis to glyphosate, chlorimuron, and diclosulam, and to assess the efficacy of alternative herbicides against these resistant biotypes. Seeds were collected from sites where plants had survived herbicide applications during the 2019/2020 and 2020/2021 seasons. Following initial screenings, biotypes were selected to establish independent dose-response curves for glyphosate, diclosulam, and chlorimuron. For each herbicide, four biotypes of C. bonariensis were tested: one susceptible (S), two putatively moderately resistant (MR) biotypes, and one putatively highly resistant (R) biotype. In each assay, eight herbicide doses were used (1/32; 1/16; 1/8; 1/2; 1; 2; and 4X for S and MR biotypes, and 1/8; 1/2; 1; 2; 4; 8; and 16X for R biotypes) based on the recommended dose (1x) for each herbicide, with four repetitions per treatment. Each assay was completely replicated twice. Resistance was confirmed through testing in two plant generations (G1 and G2). The findings reveal high levels of multiple and cross-resistance in C. bonariensis to glyphosate, diclosulam, and chlorimuron. In general, herbicides with alternative action mechanisms effectively controlled C. bonariensis exhibiting multiple and cross-resistance. This study confirms the first case of C. bonariensis cross-resistance to diclosulam and chlorimuron, and the first occurrence of multiple and cross-resistance to glyphosate, diclosulam, and chlorimuron in this species. © 2023 by the authors. |
| eu_rights_str_mv | openAccess |
| format | article |
| id | anni_4e698e30640ae50d7b57c9dcadf47e3c |
| instacron_str | Instituto Nacional de Investigación Agropecuaria |
| institution | Instituto Nacional de Investigación Agropecuaria |
| instname_str | Instituto Nacional de Investigación Agropecuaria |
| language | eng |
| language_invalid_str_mv | en |
| network_acronym_str | anni |
| network_name_str | oai-lr-anni |
| oai_identifier_str | oai:redi.anii.org.uy:20.500.12381/4632 |
| publishDate | 2024 |
| publishDateSort | 2024 |
| reponame_str | AINFO |
| repository.mail.fl_str_mv | |
| repository.name.fl_str_mv | |
| repository_id_str | |
| rights_invalid_str_mv | Acceso abierto |
| spelling | Conyza bonariensis' resistance to glyphosate, diclosulam, and chlorimuron: confirmation and alternative control for the first case of multiple and cross-resistance in Uruguay.KASPARY, T. E.WALLER, M.E.GARCIA, A.CABRERA, M.HILL, S.M.ALS inhibitorsEPSPS inhibitorHairy fleabaneHerbicide resistanceSouth AmericaWeedsÁREA DE PASTURAS Y FORRAJES - INIA.ABSTRACT.- Conyza bonariensis L. (hairy fleabane) is a significant weed in production systems, especially due to its evolving resistance to various herbicides. In Uruguay, control failures of C. bonariensis have been reported following the use of glyphosate and ALS inhibitors. The objective of this study was to investigate the occurrence of the multiple and cross-resistance of C. bonariensis to glyphosate, chlorimuron, and diclosulam, and to assess the efficacy of alternative herbicides against these resistant biotypes. Seeds were collected from sites where plants had survived herbicide applications during the 2019/2020 and 2020/2021 seasons. Following initial screenings, biotypes were selected to establish independent dose-response curves for glyphosate, diclosulam, and chlorimuron. For each herbicide, four biotypes of C. bonariensis were tested: one susceptible (S), two putatively moderately resistant (MR) biotypes, and one putatively highly resistant (R) biotype. In each assay, eight herbicide doses were used (1/32; 1/16; 1/8; 1/2; 1; 2; and 4X for S and MR biotypes, and 1/8; 1/2; 1; 2; 4; 8; and 16X for R biotypes) based on the recommended dose (1x) for each herbicide, with four repetitions per treatment. Each assay was completely replicated twice. Resistance was confirmed through testing in two plant generations (G1 and G2). The findings reveal high levels of multiple and cross-resistance in C. bonariensis to glyphosate, diclosulam, and chlorimuron. In general, herbicides with alternative action mechanisms effectively controlled C. bonariensis exhibiting multiple and cross-resistance. This study confirms the first case of C. bonariensis cross-resistance to diclosulam and chlorimuron, and the first occurrence of multiple and cross-resistance to glyphosate, diclosulam, and chlorimuron in this species. © 2023 by the authors.2025-06-23T18:36:46Z2025-06-23T18:36:46Z20242025-06-23T18:36:46ZArticlePublishedVersioninfo:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttps://ainfo.inia.uy/consulta/busca?b=pc&id=64480&biblioteca=vazio&busca=64480&qFacets=64480reponame:AINFOinstname:Instituto Nacional de Investigación Agropecuariainstacron:Instituto Nacional de Investigación Agropecuariaenenginfo:eu-repo/semantics/openAccessAcceso abiertooai:redi.anii.org.uy:20.500.12381/46322026-02-10T17:35:43Z |
| spellingShingle | Conyza bonariensis' resistance to glyphosate, diclosulam, and chlorimuron: confirmation and alternative control for the first case of multiple and cross-resistance in Uruguay. KASPARY, T. E. ALS inhibitors EPSPS inhibitor Hairy fleabane Herbicide resistance South America Weeds ÁREA DE PASTURAS Y FORRAJES - INIA. |
| status_str | publishedVersion |
| title | Conyza bonariensis' resistance to glyphosate, diclosulam, and chlorimuron: confirmation and alternative control for the first case of multiple and cross-resistance in Uruguay. |
| title_full | Conyza bonariensis' resistance to glyphosate, diclosulam, and chlorimuron: confirmation and alternative control for the first case of multiple and cross-resistance in Uruguay. |
| title_fullStr | Conyza bonariensis' resistance to glyphosate, diclosulam, and chlorimuron: confirmation and alternative control for the first case of multiple and cross-resistance in Uruguay. |
| title_full_unstemmed | Conyza bonariensis' resistance to glyphosate, diclosulam, and chlorimuron: confirmation and alternative control for the first case of multiple and cross-resistance in Uruguay. |
| title_short | Conyza bonariensis' resistance to glyphosate, diclosulam, and chlorimuron: confirmation and alternative control for the first case of multiple and cross-resistance in Uruguay. |
| title_sort | Conyza bonariensis' resistance to glyphosate, diclosulam, and chlorimuron: confirmation and alternative control for the first case of multiple and cross-resistance in Uruguay. |
| topic | ALS inhibitors EPSPS inhibitor Hairy fleabane Herbicide resistance South America Weeds ÁREA DE PASTURAS Y FORRAJES - INIA. |
| url | https://ainfo.inia.uy/consulta/busca?b=pc&id=64480&biblioteca=vazio&busca=64480&qFacets=64480 |