Multiple resistance of Conyza sumatrensis to three mechanisms of action of herbicides
Fleabane (Conyza spp.) is an important weed in grain production systems and is currently one of the most problematic weeds in Brazil. An important factor related to weeds such as fleabane is the characteristic of herbicide-resistant biotypes developed under selection pressure, with multiple resistan...
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Eduem (Editora da Universidade Estadual de Maringá)
2020-04-01
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Online Access: | http://www.periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/42485 |
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doaj-3bd0592f3dc24b9ab608f648bc1a795d2020-11-25T04:02:44ZengEduem (Editora da Universidade Estadual de Maringá)Acta Scientiarum: Agronomy1679-92751807-86212020-04-0142e42485e4248510.4025/actasciagron.v42i1.4248542485Multiple resistance of Conyza sumatrensis to three mechanisms of action of herbicidesAlfredo Junior Paiola Albrecht0Vinicius Gabriel Caneppele Pereira1Cristian Natalino Zanfrilli de Souza2Luiz Henrique Saes Zobiole3Leandro Paiola Albrecht4Fernando Storniolo Adegas5Universidade Federal do Paraná Universidade Estadual Paulista Julio de Mesquita Filho Universidade Federal do Parana Corteva AgriscienceUniversidade Federal do ParanáEmpresa Brasileira de Pesquisa AgropecuáriaFleabane (Conyza spp.) is an important weed in grain production systems and is currently one of the most problematic weeds in Brazil. An important factor related to weeds such as fleabane is the characteristic of herbicide-resistant biotypes developed under selection pressure, with multiple resistance previously detected for Conyza spp. Thus, the aim of this study was to demonstrate the multiple resistance of Conyza sumatrensis to the herbicides paraquat, glyphosate, and chlorimuron. From the F2 seeds of biotypes with suspected resistance to paraquat, glyphosate, and chlorimuron, dose-response greenhouse experiments were conducted for the three herbicides. Herbicides were applied when the plants had 6-8 leaves that were at a height of 8 cm. At the end of the evaluations, 28 days after application, multiple resistance to paraquat, glyphosate, and chlorimuron was observed, with resistance factors (RF50) for the control of 7.43, 3.58, and 14.35 and for the reduction of dry mass of 2.65, 2.79, and 11.31, respectively. All the established criteria for demonstrating new cases of weed resistance were met; thus, the first case worldwide of a Conyza species with resistance to herbicides with three different mechanisms of action was confirmed.http://www.periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/42485conyza spp.; dose-response; paraquat; glyphosate; chlorimuron. |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Alfredo Junior Paiola Albrecht Vinicius Gabriel Caneppele Pereira Cristian Natalino Zanfrilli de Souza Luiz Henrique Saes Zobiole Leandro Paiola Albrecht Fernando Storniolo Adegas |
spellingShingle |
Alfredo Junior Paiola Albrecht Vinicius Gabriel Caneppele Pereira Cristian Natalino Zanfrilli de Souza Luiz Henrique Saes Zobiole Leandro Paiola Albrecht Fernando Storniolo Adegas Multiple resistance of Conyza sumatrensis to three mechanisms of action of herbicides Acta Scientiarum: Agronomy conyza spp.; dose-response; paraquat; glyphosate; chlorimuron. |
author_facet |
Alfredo Junior Paiola Albrecht Vinicius Gabriel Caneppele Pereira Cristian Natalino Zanfrilli de Souza Luiz Henrique Saes Zobiole Leandro Paiola Albrecht Fernando Storniolo Adegas |
author_sort |
Alfredo Junior Paiola Albrecht |
title |
Multiple resistance of Conyza sumatrensis to three mechanisms of action of herbicides |
title_short |
Multiple resistance of Conyza sumatrensis to three mechanisms of action of herbicides |
title_full |
Multiple resistance of Conyza sumatrensis to three mechanisms of action of herbicides |
title_fullStr |
Multiple resistance of Conyza sumatrensis to three mechanisms of action of herbicides |
title_full_unstemmed |
Multiple resistance of Conyza sumatrensis to three mechanisms of action of herbicides |
title_sort |
multiple resistance of conyza sumatrensis to three mechanisms of action of herbicides |
publisher |
Eduem (Editora da Universidade Estadual de Maringá) |
series |
Acta Scientiarum: Agronomy |
issn |
1679-9275 1807-8621 |
publishDate |
2020-04-01 |
description |
Fleabane (Conyza spp.) is an important weed in grain production systems and is currently one of the most problematic weeds in Brazil. An important factor related to weeds such as fleabane is the characteristic of herbicide-resistant biotypes developed under selection pressure, with multiple resistance previously detected for Conyza spp. Thus, the aim of this study was to demonstrate the multiple resistance of Conyza sumatrensis to the herbicides paraquat, glyphosate, and chlorimuron. From the F2 seeds of biotypes with suspected resistance to paraquat, glyphosate, and chlorimuron, dose-response greenhouse experiments were conducted for the three herbicides. Herbicides were applied when the plants had 6-8 leaves that were at a height of 8 cm. At the end of the evaluations, 28 days after application, multiple resistance to paraquat, glyphosate, and chlorimuron was observed, with resistance factors (RF50) for the control of 7.43, 3.58, and 14.35 and for the reduction of dry mass of 2.65, 2.79, and 11.31, respectively. All the established criteria for demonstrating new cases of weed resistance were met; thus, the first case worldwide of a Conyza species with resistance to herbicides with three different mechanisms of action was confirmed. |
topic |
conyza spp.; dose-response; paraquat; glyphosate; chlorimuron. |
url |
http://www.periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/42485 |
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