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Imazethapyr Application Methods and Sequences for Imidazolinone-Tolerant Rice (Oryza sativa)

Published online by Cambridge University Press:  20 January 2017

Brian V. Ottis,
James M. Chandler and
Garry N. McCauley
Brian V. Ottis*
Affiliation:
Department of Soil and Crop Science, Texas A&M University, College Station, TX 77843-2474
James M. Chandler
Affiliation:
Department of Soil and Crop Science, Texas A&M University, College Station, TX 77843-2474
Garry N. McCauley
Affiliation:
Texas A&M Agricultural Research and Extension Center, Eagle Lake, TX 77434
*
Corresponding author's E-mail: bottis@uark.edu
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Abstract

Experiments were conducted at two locations in Texas during 2000 and 2001 to compare barnyardgrass, broadleaf signalgrass, and red rice control; rice tolerance; and grain yield after single and sequential applications of imazethapyr in imidazolinone-tolerant rice. Red rice and barnyardgrass control on a clay soil at Beaumont was at least 94% with imazethapyr at 70, 90, and 100 g ai/ha applied preplant incorporated (PPI) or preemergence (PRE) followed by (fb) at least 40 g/ha of imazethapyr applied early postemergence (EPOST). Broadleaf signalgrass control on a very fine sandy loam soil at Eagle Lake was at least 86% when imazethapyr was applied PPI or PRE fb EPOST applications of imazethapyr. Sequential postemergence applications at Beaumont resulted in at least 95% red rice and barnyardgrass control when 40 g/ha applied late postemergence followed any EPOST application. Sequential postemergence applications at Eagle Lake controlled broadleaf signalgrass 98% during both years. Imazethapyr applied postemergence injured rice 0 to 34% up to 12 d after treatment. Rice yield reductions were correlated to weed control and most likely were not associated with early-season rice injury.

Keywords

Imazethapyrimidazolinonebarnyardgrass, Echinochloa crus-galli (L.) Beauv. # ECHCGbroadleaf signalgrass, Brachiaria platyphylla (Griseb.) Nash # BRAPPred rice, Oryza sativa L. # ORYSArice, Oryza sativa L. # ORYSACLEARFIELD∗ riceNewpathEPOST, early postemergencefb, followed byLPOST, late postemergencePD, panicle differentiationPPI, preplant incorporatedPRE, preemergence

Information

Type
Research
Information
Weed Technology , Volume 17 , Issue 3 , September 2003, pp. 526 - 533
Copyright
Copyright © Weed Science Society of America 

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Footnotes

Current address: Altheimer Laboratory, University of Arkansas, 1366 W. Altheimer Drive, Fayetteville, AR 72704.

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