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Imazethapyr at Different Rates and Timings in Drill- and Water-Seeded Imidazolinone-Tolerant Rice

Published online by Cambridge University Press:  20 January 2017

Kristie J. Pellerin  and
Eric P. Webster
Kristie J. Pellerin
Affiliation:
Department of Agronomy, Louisiana State University AgCenter, Baton Rouge, LA 70803
Eric P. Webster*
Affiliation:
Department of Agronomy, Louisiana State University AgCenter, Baton Rouge, LA 70803
*
Corresponding author's E-mail: ewebster@agcenter.lsu.edu
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Abstract

Imazethapyr applied to the soil at 0, 35, 53, 70, 87, 105, and 140 g ai/ha followed by (fb) early-postemergence (EPOST) or late-postemergence (LPOST) applications at 140, 105, 87, 70, 53, 35, and 0 g ai/ha, respectively, was evaluated for weed control, crop tolerance, and grain yield in imidazolinone-tolerant rice. In drill- and water-seeded rice, imazethapyr effectively controlled barnyardgrass 91 to 97% with a soil fb EPOST or LPOST application except when applied at 105 fb 35 g/ha EPOST at 49 d after late-postemergence treatment. Rice yields were 5,920 and 3,920 kg/ ha in the drill-seeded study with a single application of imazethapyr at 140 g/ha EPOST in 2000 and 2001, respectively. These yields were greater than or equal to those from treatments with two imazethapyr applications.

Keywords

Imazethapyrbarnyardgrass, Echinochloa crus-galli (L.) Beauv # ECHCGrice, Oryza sativa L. ‘93 AS-3510’, ‘CL 141’Acetolactate synthaseALSClearfield riceDAT, days after late-postemergence treatmentEPOST, early postemergencefb, followed byIT, imidazolinone tolerantLPOST, late postemergencePOST, postemergencePPI, preplant incorporatedPRE, preemergenceSURF, surface
Type
Research
Information
Weed Technology , Volume 18 , Issue 2 , June 2004 , pp. 223 - 227
Copyright
Copyright © Weed Science Society of America 

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Footnotes

∗ Published with the approval of the Director of the Agricultural Experiment Station, Louisiana State University AgCenter, Baton Rouge, LA 70803.

References

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