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Herbicide Mixtures in Water-Seeded Imidazolinone-Resistant Rice (Oryza sativa)1

Published online by Cambridge University Press:  20 January 2017

Kristie J. Pellerin ,
Eric P. Webster ,
Wei Zhang  and
David C. Blouin
Kristie J. Pellerin
Affiliation:
Department of Agronomy, 104 Sturgis Hall, Louisiana State University AgCenter, Baton Rouge, LA 70803
Eric P. Webster*
Affiliation:
Department of Agronomy, 104 Sturgis Hall, Louisiana State University AgCenter, Baton Rouge, LA 70803
Wei Zhang
Affiliation:
Department of Agronomy, 104 Sturgis Hall, Louisiana State University AgCenter, Baton Rouge, LA 70803
David C. Blouin
Affiliation:
Department of Experimental Statistics, 45 Agriculture Administration Building, Louisiana State University, Baton Rouge, LA 70803
*
Corresponding author's E-mail: ewebster@agcenter.lsu.edu
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Abstract

Imazethapyr-based weed control treatments were evaluated in water-seeded imidazolinone-resistant (IR) rice in Louisiana in 2000 and 2001. Treatments included imazethapyr applied to soil before seedling flood (surface [SURF] applied) or no soil application (no SURF), followed by imazethapyr applied postemergence (POST). Averaged over SURF application treatments (SURF, no SURF), all imazethapyr mixtures increased control of barnyardgrass at 14 and 42 d after POST treatment (DAT) compared with imazethapyr alone. Treatments containing imazethapyr-applied SURF followed by POST treatments controlled red rice 90 to 96% at 21 DAT. Alligatorweed and hemp sesbania control increased with POST mixtures compared with imazethapyr-only treatments at 35 DAT. Rice yield increased with imazethapyr applied SURF compared with no SURF application, averaged over POST applications. Other herbicides will be required to control troublesome weeds such as hemp sesbania and alligatorweed in an IR rice production system.

Keywords

Imazethapyralligatorweed, Alternanthera philoxeroides (Mart.) Griseb. #3 ALRPHbarnyardgrass, Echinochloa crus-galli (L.) Beauv. # ECHCGhemp sesbania, Sesbania exaltata (Raf.) Rydb. ex A.W. Hill # SEBEXred rice, Oryza sativa L. # ORYSArice, Oryza sativa L. ‘93 AS-3510’, ‘CL 121’Acetolactate synthaseClearfield riceherbicide mixturesALS, acetolactate synthase (EC 4.1.3.18)DAT, days after postemergence treatmentIR, imidazolinone-resistantPOST, postemergencePPI, preplant incorporatedPRE, preemergenceSURF, surface
Type
Research
Information
Weed Technology , Volume 17 , Issue 4 , December 2003 , pp. 836 - 841
Copyright
Copyright © Weed Science Society of America 

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