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Differential Tolerance of Clearfield Rice Cultivars to Imazamox

Published online by Cambridge University Press:  20 January 2017

Jason A. Bond  and
Timothy W. Walker
Jason A. Bond*
Affiliation:
Delta Research and Extension Center, Mississippi State University, Stoneville, MS 38776
Timothy W. Walker
Affiliation:
Delta Research and Extension Center, Mississippi State University, Stoneville, MS 38776
*
Corresponding author's E-mail: [email protected].
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Abstract

Field studies were conducted to compare the response of one inbred (‘CL161’) and two hybrid (‘CLXL729’ and ‘CLXL745’) Clearfield (CL) rice cultivars to imazamox. Imazamox was applied at 44 and 88 g ai ha−1 to rice in the panicle initiation (PI) and PI plus 14 d (PI + 14) growth stages and at 44 g ha−1 to rice in the midboot growth stage. Maturity of hybrid CL cultivars was delayed following imazamox at 44 g ha−1 applied at PI + 14 and midboot. Furthermore, imazamox at 44 g ha−1, applied at midboot, delayed maturity of CLXL745 more than CLXL729. Expressed as a percentage of the weed-free control plots, rough rice yields for CLXL729 were 91% following imazamox at 44 g ha−1 applied at PI + 14, 78% following imazamox at 44 g ha−1 applied at midboot, and 77% for imazamox at 88 g ha−1 applied at PI + 14. Rough rice yield for CLXL745 was 77 to 92% of the control following all imazamox treatments. All imazamox treatments reduced CLXL745 rough rice yield compared with CL161. Rough rice yield, pooled across CL cultivar, varied with imazamox treatment between years, and these differences may have been a consequence of lower temperatures and solar radiation in the first year. Hybrid CL cultivars CLXL729 and CLXL745 were less tolerant than was CL161 when imazamox was applied at nonlabeled rates (88 g ha−1) and/or timings (PI + 14 or midboot). Because of variability in rice growth stages and irregularities in imazamox application in commercial fields, inbred CL cultivars should be planted where an imazamox application will likely be required.

Se realizaron estudios de campo para comparar la respuesta de un cultivar endogámico (CL161) y dos cultivares híbridos de arroz Clearfield® (CL), (CLXL729 y CLXL745) al imazamox. Se aplicó imazamox a 44 y 88 g ia ha-1 al arroz en las siguiente etapas de crecimiento: período de iniciación de la panícula (IP) e IP más 14 días (IP+14) y a 44 g ha-1 en la etapa media del llenado del grano. La madurez de los cultivares híbridos CL se retrasó después de la aplicación de imazamox a 44 g ha-1 en las etapas IP+14 y media del llenado del grano. Además, el imazamox a 44 g ha-1 aplicado en la etapa media del llenado del grano retrasó la madurez del CLXL745 más que en el CLXL729. Expresado como porcentaje del rendimiento de las parcelas control libres de malezas, el rendimiento de arroz en bruto para CLXL729 fue 91% al aplicar imazamox a 44 g ha-1 en la etapa IP+14, 78% al aplicar imazamox a 44 g ha-1 en la etapa media del llenado del grano y 77% para imazamox a 88 g ha-1 aplicado a IP+14. El rendimiento de arroz en bruto para CLXL745 fue de 77 a 92% del rendimiento de la parcela de control en todos los tratamientos de imazamox. Todos los tratamientos con imazamox redujeron el rendimiento del CLXL745, comparado con CL161. El rendimiento de arroz en bruto, agrupado por cultivar CL, varió con tratamientos de imazamox entre años y estas diferencias pudieran haber sido una consecuencia de temperaturas más bajas y menor radiación solar en el primer año. Los cultivares híbridos CL, CLXL729 y CLXL745 fueron menos tolerantes que CL161 cuando imazamox se aplicó a dosis no recomendada en la etiqueta (88 g ha) y/o tiempos de aplicación no recomendados (IP+14 o etapa media del llenado del grano). Debido a la variabilidad en las etapas de crecimiento y las irregularidades en la aplicación del imazamox en campos comerciales, los cultivares endogámicos CL deben sembrarse en lugares donde probablemente se requerirá una aplicación de imazamox.

Keywords

Imazamoxrice, Oryza sativa L.Application timingcrop sensitivityherbicide susceptibilitymidbootpanicle initiation
Type
Weed Management—Major Crops
Information
Weed Technology , Volume 25 , Issue 2 , June 2011 , pp. 192 - 197
Copyright
Copyright © Weed Science Society of America 

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Footnotes

Published with the approval of the Director of the Mississippi Agriculture and Forestry Experiment Station as J-11964.

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