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Imazethapyr plus Propanil Mixtures in Imidazolinone-Resistant Rice

Published online by Cambridge University Press:  21 November 2017

Eric P. Webster ,
Gustavo M. Teló ,
David C. Blouin  and
Benjamin M. McKnight
Eric P. Webster*
Affiliation:
Professor, School of Plant, Environmental, and Soil Science, Louisiana State University Agricultural Center, Baton Rouge, LA, USA
Gustavo M. Teló
Affiliation:
Postdoctoral Researcher, School of Plant, Environmental, and Soil Science, Louisiana State University Agricultural Center, Baton Rouge, LA, USA
David C. Blouin
Affiliation:
Professor, Department of Experimental Statistics, Louisiana State University Agricultural Center, Baton Rouge, LA, USA
Benjamin M. McKnight
Affiliation:
Research Associate, School of Plant, Environmental, and Soil Science, Louisiana State University Agricultural Center, Baton Rouge, LA, USA
*
Author for correspondence: E. P. Webster, School of Plant, Environmental, and Soil Science, Louisiana State University Agricultural Center, 104 Sturgis Hall, Baton Rouge, LA 70803. (E-mail: ewebster@agcenter.lsu.edu)
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Abstract

A study was conducted in three locations in Louisiana to evaluate interactions of imazethapyr at 0 and 70 g ai ha−1 mixed with propanil at 0, 1,120, 2,240, 3,360, and 4,480 g ha−1 for the control of red rice, barnyardgrass, and hemp sesbania. According to Blouin’s modified Colby’s, a synergistic response occurred for red rice treated with imazethapyr mixed with propanil at 4,480 g ha−1 for all evaluations. Observed control was 93% to 95% compared with expected control of 81% to 87%. An antagonistic response occurred for barnyardgrass control with imazethapyr mixed with propanil at 1,120 g ha−1 at 35 and 49 d after treatment (DAT), with control of 75% and 64%, respectively, compared with expected control of 89% and 78%. However, a neutral response occurred for barnyardgrass control when treated with all other imazethapyr plus propanil combinations. An antagonistic interaction occurred for hemp sesbania when treated with imazethapyr plus propanil at 3,360 and 4,480 g ha−1 at 21 DAT with an observed control of 89% compared with an expected control of 96%; however, a neutral response occurred at all other evaluation dates. An increase in rice yield was observed with an imazethapyr plus propanil at 4,480 g ha−1 mixture compared with a single application of imazethapyr or propanil at any rate evaluated.

Keywords

Jason Bond, Mississippi State UniversityImazethapyrpropanilbarnyardgrass, Echinochloa crus-galli (L.) Beauv.hemp sesbania, Sesbania herbacea (P. Mill.) McVaughred rice/rice, Oryza sativa L.Antagonismherbicide interactionsneutral interactionsynergism
Type
Weed Management-Major Crops
Information
Weed Technology , Volume 32 , Issue 1 , February 2018 , pp. 45 - 51
Copyright
© Weed Science Society of America, 2017 

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