Conyza sumatrensis Resistant to Paraquat, Glyphosate and Chlorimuron: Confirmation and Monitoring the First Case of Multiple Resistance in Paraguay

Alfredo Junior Paiola Albrecht, Guilherme Thomazini, Leandro Paiola Albrecht, Afonso Pires, Juliano Bortoluzzi Lorenzetti, Maikon Tiago Yamada Danilussi, André Felipe Moreira Silva and Fernando Storniolo Adegas
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Alfredo Junior Paiola Albrecht: Department of Agronomic Sciences, Federal University of Paraná, Palotina, PR 85950-000, Brazil
Guilherme Thomazini: Department of Agronomic Sciences, Maringá State University, Umuarama, PR 87502-970, Brazil
Leandro Paiola Albrecht: Department of Agronomic Sciences, Federal University of Paraná, Palotina, PR 85950-000, Brazil
Afonso Pires: Semillas Pires, Corpus Christi, Canindeyú 7850, Paraguay
Juliano Bortoluzzi Lorenzetti: Department of Crop Science and Phytosanitary, Federal University of Paraná, Curitiba, PR 80060-000, Brazil
Maikon Tiago Yamada Danilussi: Department of Crop Science and Phytosanitary, Federal University of Paraná, Curitiba, PR 80060-000, Brazil
André Felipe Moreira Silva: Crop Science, Palotina, PR 85950-000, Brazil
Fernando Storniolo Adegas: Embrapa Soybean, Londrina, PR 86001-970, Brazil

Agriculture, 2020, vol. 10, issue 12, 1-11

Abstract: Conyza sumatrensis was reported to be associated with 20 cases of herbicide resistance worldwide, with a recent report of multiple drug resistance to paraquat, glyphosate, and chlorimuron in Brazil. In Paraguay, there were no reports of cases of resistance for this species; however, in 2017, researchers began identifying biotypes with resistance to paraquat, glyphosate, and chlorimuron, which is the focus of the present study. The goal of this study was to investigate the case of multiple resistance of C. sumatrensis to paraquat, glyphosate, and chlorimuron and to monitor the resistant biotypes in the departments of Canindeyú and Alto Paraná. Seeds were collected from sites where plants survived after herbicide application in the 2017/18 and 2018/19 seasons. After screening, biotypes were selected for the construction of dose–response curves. A resistance factor (RF) of 6.79 was observed for 50% control (C 50 ) and 3.92 for 50% growth reduction (GR 50 ) for the application of paraquat. An RF of 12.32 was found for C 50 and 4.15 for GR 50 for the application of glyphosate. For the application of chlorimuron, an RF of 11.32 was found for C 50 and 10.96 for GR 50 . This confirms the multiple resistance of the C. sumatrensis biotype to paraquat, glyphosate, and chlorimuron. Population monitoring indicated the presence of C. sumatrensis with multiple resistance in departments of Canindeyú and Alto Paraná, Paraguay.

Keywords: ALS inhibitors; EPSPs inhibitors; herbicides; herbicide-resistance; South America; Sumatran fleabane; photosystem I inhibitor; weeds (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
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