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Imazethapyr is Safe and Effective for Imidazolinone-Tolerant Rice Grown on Coarse-Textured Soils

Published online by Cambridge University Press:  20 January 2017

Brian V. Ottis ,
John H. O'Barr ,
Garry N. McCauley  and
James M. Chandler
Brian V. Ottis*
Affiliation:
Department of Soil and Crop Science, Texas A&M University, College Station, TX 77843-2474
John H. O'Barr
Affiliation:
Department of Soil and Crop Science, Texas A&M University, College Station, TX 77843-2474
Garry N. McCauley
Affiliation:
Department of Soil and Crop Science, Texas A&M University, College Station, TX 77843-2474
James M. Chandler
Affiliation:
Texas A&M Agricultural Research and Extension Center, Eagle Lake, TX 77434
*
Corresponding author's E-mail: [email protected]
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Abstract

A study was conducted in 2001 and 2002 in Texas to evaluate red rice control and crop response of imidazolinone-tolerant rice with imazethapyr on coarse-textured soils. Because imazethapyr was not registered for use on imidazolinone-tolerant rice on coarse-textured soils in Texas, crop response was evaluated to determine whether imidazolinone-tolerant rice yields would be reduced with sequential applications of imazethapyr on soils having greater than 50% sand content. The treatment factors consisted of preemergence (PRE) applications of imazethapyr at 50, 70, or 87 g ai/ ha followed by (fb) preflood (PREFLD) applications of 35 or 50 g/ha. Imazethapyr at 70 g/ha PRE fb 70 g/ha PREFLD was added as a seventh treatment. PRE applications were activated by rainfall or surface irrigation after application, and PREFLD applications were sprayed 1 to 2 d before application of the permanent flood. In both years, 100% red rice control was achieved with all rate combinations. Early-season visual rice injury ranged from 5 to 21% and did not result in yield losses, indicating that imazethapyr is safe on coarse-textured soils.

Keywords

Imazethapyrred rice, Oryza sativa L. #3 ORYSArice, Oryza sativa L. ‘CL121’DAT, days after treatmentfb, followed byPRE, preemergencePREFLD, preflood.
Type
Research
Information
Weed Technology , Volume 18 , Issue 4 , December 2004 , pp. 1096 - 1100
Copyright
Copyright © Weed Science Society of America 

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