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1 April 2004 Imazethapyr at Different Rates and Timings in Drill- and Water-Seeded Imidazolinone-Tolerant Rice
KRISTIE J. PELLERIN, ERIC P. WEBSTER
Author Affiliations +
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.

Nomenclature: Imazethapyr; barnyardgrass, Echinochloa crus-galli (L.) Beauv #3 ECHCG; rice, Oryza sativa L. ‘93 AS-3510’, ‘CL 141’.

Additional index words: Acetolactate synthase, ALS, Clearfield rice.

Abbreviations: DAT, days after late-postemergence treatment; EPOST, early postemergence; fb, followed by; IT, imidazolinone tolerant; LPOST, late postemergence; POST, postemergence; PPI, preplant incorporated; PRE, preemergence; SURF, surface.

KRISTIE J. PELLERIN and ERIC P. WEBSTER "Imazethapyr at Different Rates and Timings in Drill- and Water-Seeded Imidazolinone-Tolerant Rice," Weed Technology 18(2), 223-227, (1 April 2004). https://doi.org/10.1614/WT-03-005
Published: 1 April 2004
JOURNAL ARTICLE
5 PAGES


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