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Effect of Flood Timing on Red Rice (Oryza spp.) Control with Imazethapyr Applied at Different Dry-Seeded Rice Growth Stages

Published online by Cambridge University Press:  20 January 2017

Luis A. Avila
Affiliation:
Department of Soil and Crop Sciences, Texas A&M University, College Station, TX 77843-2474, Research fellow, CAPES/Brazil and Assistant Professor at Universidade Federal de Santa Maria (UFSM), Santa Maria 97105-900, RS, Brazil
Scott A. Senseman*
Affiliation:
Department of Soil and Crop Sciences, Texas A&M University, College Station, TX 77843-2474
Garry N. McCauley
Affiliation:
Texas Agricultural Experiment Station, Eagle Lake, TX 77434
James M. Chandler
Affiliation:
Department of Soil and Crop Sciences, Texas A&M University, College Station, TX 77843-2474
John H. O'Barr
Affiliation:
Department of Soil and Crop Sciences, Texas A&M University, College Station, TX 77843-2474
*
Corresponding author's E-mail: s-senseman@tamu.edu

Abstract

Field experiments were conducted in 2002 and 2003 in Beaumont, TX, to evaluate the effect of flood timing on red rice control with imazethapyr applied at different cultivated rice growth stages. Treatments included flood establishment at 1, 7, 14, and 21 d after postemergence (POST) herbicide treatment (DAT). Imazethapyr was applied preemergence at 70 g ai/ha followed by 70 g/ ha POST when imidazolinone-tolerant rice cultivar ‘CL-161’ had three- to four-leaf stage (EPOST) or five-leaf stage (LPOST). Flood needed to be established within 14 DAT to achieve at least 95% red rice control when imazethapyr was applied EPOST. However, flood needed to be established within 7 DAT to provide at least 95% red rice control when imazethapyr was applied LPOST. Delaying the flood up to 21 DAT reduced rice grain yield for both application timings.

Type
Research Article
Copyright
Copyright © Weed Science Society of America 

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