Glyphosate and Saflufenacil: Elucidating Their Combined Action on the Control of Glyphosate-Resistant Conyza bonariensis

Cristiano Piasecki, Ivan R. Carvalho, Luis A. Avila, Dirceu Agostinetto and Leandro Vargas
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Cristiano Piasecki: Department of Crop Protection, Federal University of Pelotas, Pelotas, RS 96160-000, Brazil
Ivan R. Carvalho: Department of Plant Breeding, Federal University of Pelotas (UFPel), Pelotas, RS 96010-610, Brazil
Luis A. Avila: Department of Crop Protection, Federal University of Pelotas, Pelotas, RS 96160-000, Brazil
Dirceu Agostinetto: Department of Crop Protection, Federal University of Pelotas, Pelotas, RS 96160-000, Brazil
Leandro Vargas: Department of Weed Science, Brazilian Agricultural Research Corporation (EMBRAPA), Passo Fundo, RS 99050-970, Brazil

Agriculture, 2020, vol. 10, issue 6, 1-18

Abstract: Synergic effects of glyphosate and saflufenacil have been reported to control Conyza spp. However, the mechanism of this synergic combination is unknown. The objectives of this study were to investigate the effects of the combination of glyphosate and saflufenacil on the control and resistance status of glyphosate-resistant (GR) C . bonariensis , as well as on oxidative stress and lipidic peroxidation. Glyphosate-resistant and glyphosate-sensitive (GS) biotypes were treated with different rates of saflufenacil, glyphosate, and glyphosate combined with saflufenacil. The combination of glyphosate (1480 g ae ha −1 ) and saflufenacil (≥15 g ha −1 ) presented the best control of GR plants compared with their individual effects. It also reduced the resistance factor from 19.6 to 4.6 (4.3-fold) and represents a good alternative for resistance management. The combination of glyphosate and saflufenacil resulted in higher oxidative stress and lipidic peroxidation compared with the effects of either herbicide alone. The oxidative stress and lipid peroxidation promoted by the combination of the herbicides occurred earlier after treatment and remained at higher levels over a longer period (12–192 h) compared with their individual results. The combined oxidative stress and lipid peroxidation at high levels over a long time is likely to be one reason that the combination of glyphosate and saflufenacil effectively controls GR C. bonariensis .

Keywords: reactive oxygen species (ROS); oxidative stress; shikimic-acid; lipidic peroxidation; herbicide resistance management; herbicide synergism; mixture of herbicides (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
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