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Weed Control Programs in Drill-Seeded Imidazolinone-Resistant Rice (Oryza sativa)

Published online by Cambridge University Press:  20 January 2017

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

A study was conducted to evaluate weed control with imazethapyr applied at different timings or a combination of timings with or without an early POST application of bensulfuron, bentazon plus aciflurofen, bispyribac, carfentrazone, halosulfuron, propanil plus molinate, or triclopyr in drill-seeded imidazolinone-resistant rice. Control of barnyardgrass, red rice, and alligatorweed was insufficient with imazethapyr at 87 g/ha PRE or at 53 g/ha late POST alone. Imazethapyr at 87 g/ha PRE followed by imazethapyr at 53 g/ha late POST controlled red rice 86% or greater but did not control hemp sesbania. The imazethapyr PRE followed by late POST combination was also weak on barnyardgrass and alligatorweed early in the season. The addition of an early POST application of the other herbicides to the imazethapyr combination improved overall weed control, especially hemp sesbania control. Among the early POST herbicides, bispyribac, carfentrazone, or propanil plus molinate were more effective in helping improve the overall weed control, resulting in better rice grain yield.

Keywords

Aciflurofenbensulfuronbentazoncarfentrazonebispyribachalosulfuronimazethapyrmolinatepropaniltriclopyralligatorweed, 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., imidazolinone-resistant ‘93 AS-3510’ and ‘CL 121’ALSacetolactate synthaseClearfield riceALS, acetolactate synthaseDAT, days after LPOST treatmentEPOST, early postemergencefb, followed byIR, imidazolinone-resistantLPOST, late postemergenceLSU, Louisiana State University
Type
Research
Information
Weed Technology , Volume 20 , Issue 4 , December 2006 , pp. 956 - 960
Copyright
Copyright © Weed Science Society of America 

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