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

Agriculture

卷:10

AndréFelipe Moreira Silva¹  AlfredoJunior Paiola Albrecht²  LeandroPaiola Albrecht²  Guilherme Thomazini³  MaikonTiago Yamada Danilussi⁴  JulianoBortoluzzi Lorenzetti⁴  FernandoStorniolo Adegas⁵  Afonso Pires⁶ 

[1] Crop Science, Palotina, PR 85950-000,Brazil;

[2] Department of Agronomic Sciences, Federal University of Paraná, Palotina, PR 85950-000, Brazil;

[3] Department of Agronomic Sciences, Maringá State University, Umuarama, PR 87502-970, Brazil;

[4] Department of Crop Science and Phytosanitary, Federal University of Paraná, Curitiba, PR 80060-000, Brazil;

[5] Embrapa Soybean, Londrina, PR 86001-970, Brazil;

[6] Semillas Pires, Corpus Christi, Canindeyú 7850, Paraguay;

关键词: ALS inhibitors;    EPSPs inhibitors;    herbicides;    herbicide-resistance;    South America;    Sumatran fleabane;   

DOI  :  10.3390/agriculture10120582

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown