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

Published online by Cambridge University Press:  19 October 2020

Tameka L. Sanders ,
Jason A. Bond Open the ORCID record for Jason A. Bond [Opens in a new window] ,
Benjamin H. Lawrence ,
Bobby R. Golden ,
Thomas W. Allen  and
Taghi Bararpour
Tameka L. Sanders
Affiliation:
Research Associate II
Jason A. Bond*
Affiliation:
Research/Extension Professor
Benjamin H. Lawrence
Affiliation:
Assistant Extension/Research Professor
Bobby R. Golden
Affiliation:
Associate Extension/Research Professor
Thomas W. Allen
Affiliation:
Extension/Research Professor
Taghi Bararpour
Affiliation:
Assistant Research/Extension Professor, Delta Research and Extension Center, Mississippi State University, Stoneville, MS, USA
*
Author for correspondence: Jason A. Bond, Research/Extension Professor, Delta Research and Extension Center, Mississippi State University, P.O. Box 197, Stoneville, MS38776. (Email: [email protected])
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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 broad-spectrum weed control in acetyl coenzyme A carboxylase–resistant rice.

Keywords

Florpyrauxifen-benzyl, quizalofop-P-ethylbarnyardgrass, Echinochloa crus-galli L. Beauv. ECHCGvolunteer rice, Oryza sativa L. ORYSArice, Oryza sativa L. ‘PVL01’Application rateapplication timingpostfloodprefloodsequential applications
Type
Research Article
Information
Weed Technology , Volume 35 , Issue 2 , April 2021 , pp. 258 - 262
Copyright
© The Author(s), 2020. Published by Cambridge University Press on behalf of the Weed Science Society of America

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Footnotes

Associate Editor: Drew Lyon, Washington State University

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