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Article

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

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Department of Agronomic Sciences, Federal University of Paraná, Palotina, PR 85950-000, Brazil
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Department of Agronomic Sciences, Maringá State University, Umuarama, PR 87502-970, Brazil
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Semillas Pires, Corpus Christi, Canindeyú 7850, Paraguay
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Department of Crop Science and Phytosanitary, Federal University of Paraná, Curitiba, PR 80060-000, Brazil
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Crop Science, Palotina, PR 85950-000, Brazil
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Embrapa Soybean, Londrina, PR 86001-970, Brazil
*
Author to whom correspondence should be addressed.
Agriculture 2020, 10(12), 582; https://doi.org/10.3390/agriculture10120582
Received: 8 October 2020 / Revised: 15 November 2020 / Accepted: 19 November 2020 / Published: 26 November 2020
(This article belongs to the Section Crop Protection, Diseases, Pest and Weeds)
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 (C50) and 3.92 for 50% growth reduction (GR50) for the application of paraquat. An RF of 12.32 was found for C50 and 4.15 for GR50 for the application of glyphosate. For the application of chlorimuron, an RF of 11.32 was found for C50 and 10.96 for GR50. 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. View Full-Text
Keywords: ALS inhibitors; EPSPs inhibitors; herbicides; herbicide-resistance; South America; Sumatran fleabane; photosystem I inhibitor; weeds ALS inhibitors; EPSPs inhibitors; herbicides; herbicide-resistance; South America; Sumatran fleabane; photosystem I inhibitor; weeds
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MDPI and ACS Style

Albrecht, A.J.P.; Thomazini, G.; Albrecht, L.P.; Pires, A.; Lorenzetti, J.B.; Danilussi, M.T.Y.; Silva, A.F.M.; Adegas, F.S. Conyza sumatrensis Resistant to Paraquat, Glyphosate and Chlorimuron: Confirmation and Monitoring the First Case of Multiple Resistance in Paraguay. Agriculture 2020, 10, 582. https://doi.org/10.3390/agriculture10120582

AMA Style

Albrecht AJP, Thomazini G, Albrecht LP, Pires A, Lorenzetti JB, Danilussi MTY, Silva AFM, Adegas FS. Conyza sumatrensis Resistant to Paraquat, Glyphosate and Chlorimuron: Confirmation and Monitoring the First Case of Multiple Resistance in Paraguay. Agriculture. 2020; 10(12):582. https://doi.org/10.3390/agriculture10120582

Chicago/Turabian Style

Albrecht, Alfredo J.P., Guilherme Thomazini, Leandro P. Albrecht, Afonso Pires, Juliano B. Lorenzetti, Maikon T.Y. Danilussi, André F.M. Silva, and Fernando S. Adegas. 2020. "Conyza sumatrensis Resistant to Paraquat, Glyphosate and Chlorimuron: Confirmation and Monitoring the First Case of Multiple Resistance in Paraguay" Agriculture 10, no. 12: 582. https://doi.org/10.3390/agriculture10120582

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