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1 April 2006 Imidazolinone-Tolerant Rice Response to Imazethapyr Application
RONALD J. LEVY, JASON A. BOND, ERIC P. WEBSTER, JAMES L. GRIFFIN, WEI P. ZHANG, STEVEN D. LINSCOMBE
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Abstract

Greenhouse research was conducted to evaluate shoot and root growth response of imidazolinone-tolerant (IT) rice cultivars to imazethapyr applied postemergence at various rates and application timings. Imazethapyr was applied at 70, 140, and 280 g ai/ha to IT cultivars ‘CL 121’ and ‘CL 161’ in the one- to two-leaf and three- to four-leaf growth stages. Imazethapyr applied to one- to two-leaf or three- to four-leaf rice at 70, 140, and 280 g/ha was more injurious to CL 121 than to CL 161. At 3 wk after treatment (WAT), CL 121 was injured 23 to 38% regardless of application timing. In contrast, CL 161 was injured no more than 11% at 3 WAT. Shoot:root ratio for CL 161 was not affected by imazethapyr application. For CL 121, shoot:root ratio was lower following imazethapyr at 280 g/ha than at 70 or 140 g/ha. Based on shoot fresh weight following imazethapyr at 70 g/ha, CL 161 was 1.8 times more tolerant than CL 121 at 2 WAT and 1.3 times more tolerant at 3 WAT. The IT rice cultivar CL 161 is inherently more tolerant to imazethapyr than is CL 121 based on visual injury and shoot and root growth.

Nomenclature: Imazethapyr; rice, Oryza sativa L. ‘CL 121’, ‘CL 161’.

Additional index words: Application timing, rice injury, shoot:root ratio.

Abbreviations: ALS, acetolactate synthase; IT, imidazolinone-tolerant; WAT, weeks after treatment.

RONALD J. LEVY, JASON A. BOND, ERIC P. WEBSTER, JAMES L. GRIFFIN, WEI P. ZHANG, and STEVEN D. LINSCOMBE "Imidazolinone-Tolerant Rice Response to Imazethapyr Application," Weed Technology 20(2), 389-393, (1 April 2006). https://doi.org/10.1614/WT-05-118R.1
Published: 1 April 2006
JOURNAL ARTICLE
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