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Evaluation of sequential applications of quizalofop-P-ethyl and florpyrauxifen-benzyl in acetyl CoA carboxylase-resistant rice

Abstract Information on performance of sequential treatments of quizalofop-P-ethyl with florpyrauxifen-benzyl on rice is lacking. Field studies were conducted in 2017 and 2018 in Stoneville, MS, to evaluate sequential timings… Click to show full abstract

Abstract Information on performance of sequential treatments of quizalofop-P-ethyl with florpyrauxifen-benzyl on rice is lacking. Field studies were conducted in 2017 and 2018 in Stoneville, MS, to evaluate sequential timings of quizalofop-P-ethyl with florpyrauxifen-benzyl included in preflood treatments of rice. Quizalofop-P-ethyl treatments were no quizalofop-P-ethyl; sequential applications of quizalofop-P-ethyl at 120 g ha–1 followed by (fb) 120 g ai ha–1 applied to rice in the 2- to 3-leaf (EPOST) fb the 4-leaf to 1-tiller (LPOST) growth stages or LPOST fb 10 d after flooding (PTFLD); quizalofop-P-ethyl at 100 g ha–1 fb 139 g ha–1 EPOST fb LPOST or LPOST fb PTFLD; quizalofop-P-ethyl at 139 g ha–1 fb 100 g ha–1 EPOST fb LPOST and LPOST fb PTFLD; and quizalofop-P-ethyl at 85 g ha–1 fb 77 g ha–1 fb 77 g ha–1 EPOST fb LPOST fb PTFLD. Quizalofop-P-ethyl was applied alone and in mixture with florpyrauxifen-benzyl at 29 g ai ha–1 LPOST. Visible rice injury 14 d after PTFLD (DA-PTFLD) was no more than 3%. Visible control of volunteer rice (‘CL151' and ‘Rex') 7 DA-PTFLD was similar and at least 95% for each quizalofop-P-ethyl treatment. Barnyardgrass control with quizalofop-P-ethyl at 120 fb 120 g ha–1 LPOST fb PTFLD was greater (88%) in mixture with florpyrauxifen-benzyl. The addition of florpyrauxifen-benzyl to quizalofop-P-ethyl increased rough rice yield when quizalofop-P-ethyl was applied at 100 g ha–1 fb 139 g ha–1 EPOST fb LPOST. Sequential applications of quizalofop-P-ethyl at 120 g ha–1 fb 120 g ha–1 EPOST fb LPOST, 100 g ha–1 fb 139 g ha–1 EPOST fb LPOST, or 139 g ha–1 fb 100 g ha–1 EPOST fb LPOST controlled grass weed species. The addition of florpyrauxifen-benzyl was not beneficial for grass weed control. However, because quizalofop-P-ethyl does not control broadleaf weeds, florpyrauxifen-benzyl could provide broadspectrum weed control in acetyl coenzyme A carboxylase–resistant rice. Nomenclature: Florpyrauxifen-benzyl, quizalofop-P-ethyl; barnyardgrass, Echinochloa crus-galli L. Beauv. ECHCG; volunteer rice, Oryza sativa L. ORYSA; rice, Oryza sativa L. ‘PVL01'

Keywords: lpost; florpyrauxifen benzyl; quizalofop ethyl; rice

Journal Title: Weed Technology
Year Published: 2020

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