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13 January 2020 Evaluation of sequential applications of quizalofop-p-ethyl and propanil plus thiobencarb in acetyl-coA carboxylase inhibitor–resistant rice
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Abstract

A field study was conducted in 2015 and 2016 at the H. Rouse Caffey Rice Research Station near Crowley, Louisiana, to evaluate the interactions of quizalofop and a mixture of propanil plus thiobencarb applied sequentially or mixed to control weedy rice and barnyardgrass. Visual weed control evaluations occurred at 14, 28, and 42 d after treatment (DAT). Quizalofop was applied at 120 g ai ha–1 at 7, 3, and 1 d before and after propanil plus thiobencarb were each applied at 3,360 g ai ha–1. In addition, quizalofop was applied alone and in a mixture with propanil plus thiobencarb at day 0. Control of red rice ‘CL-111' and ‘CLXL-745' was greater than 91% when quizalofop was applied alone at day 0, similar to control for quizalofop applied 7, 3, and 1 d prior to propanil plus thiobencarb at all evaluation dates. Control of the same weeds treated with quizalofop plus propanil plus thiobencarb applied in a mixture at day 0 was 70% to 76% at each evaluation date, similar to quizalofop applied 1 or 3 d after propanil plus thiobencarb. A similar trend in control of barnyardgrass by 88% to 97% occurred when quizalofop was applied alone and by 48% to 53% at 14, 28, and 42 DAT when the mixture was used. ‘PVL01’ rough rice yield was 4,060 kg ha–1 when treated with quizalofop alone; however, yield was reduced to 3,180 kg ha–1 when it was treated with quizalofop mixed with propanil plus thiobencarb at day 0, similar to PVL01 rice treated with quizalofop 1 or 3 d following the propanil plus thiobencarb application.

Nomenclature: quizalofop; propanil; thiobencarb; barnyardgrass; Echinochloa crus-galli (L.) P. Beauv; weedy rice, Oryza sativa L; rice, Oryza sativa L

© Weed Science Society of America, 2020.
Samer Y. Rustom Jr., Eric P. Webster, Benjamin M. McKnight, and David C. Blouin "Evaluation of sequential applications of quizalofop-p-ethyl and propanil plus thiobencarb in acetyl-coA carboxylase inhibitor–resistant rice," Weed Technology 34(4), 506-510, (13 January 2020). https://doi.org/10.1017/wet.2020.9
Received: 10 October 2019; Accepted: 6 January 2020; Published: 13 January 2020
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