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Imazethapyr Use with and without Clomazone for Weed Control in Furrow-Irrigated, Imidazolinone-Tolerant Rice

Published online by Cambridge University Press:  20 January 2017

Jason K. Norsworthy ,
Griff M. Griffith  and
Robert C. Scott
Jason K. Norsworthy*
Affiliation:
Department of Crop, Soil, and Environmental Sciences; 1366 West Altheimer Drive, Fayetteville, AR 72704
Griff M. Griffith
Affiliation:
Department of Crop, Soil, and Environmental Sciences; 1366 West Altheimer Drive, Fayetteville, AR 72704
Robert C. Scott
Affiliation:
Department of Crop, Soil, and Environmental Sciences; 1366 West Altheimer Drive, Fayetteville, AR 72704
*
Corresponding author's E-mail: jnorswor@uark.edu
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Abstract

Research on weed management in furrow-irrigated rice is needed as water availability becomes more limited in rice production regions of Arkansas. Research was conducted at Keiser and Pine Tree, AR, with the objectives being to determine (1) whether the addition of clomazone to imazethapyr would improve PRE weed control in furrow-irrigated, imidazolinone-tolerant rice, and (2) whether increasing the imazethapyr rates would improve weed control without injuring rice. Imazethapyr was applied at 70, 87.5, and 105 g ai/ha PRE with and without clomazone followed by imazethapyr POST at the same rate as used PRE. No rice injury was observed during the growing season at either site. Clomazone plus imazethapyr applied PRE did not improve early season control of Palmer amaranth, pitted morningglory, prickly sida, barnyardgrass, or broadleaf signalgrass over imazethapyr alone. Increasing the PRE imazethapyr rate to 105 g/ha did not improve Palmer amaranth or pitted morningglory control. Imazethapyr applied PRE on a clay soil generally provided lower weed control than on the silt loam soil. Increasing the imazethapyr rate did not improve rice yields.

Keywords

Clomazone, imazethapyr, barnyardgrass, Echinochloa crus-galli (L.) Beauv. ECHCG, broadleaf signalgrass, Urochloa platyphylla (Nash) R.D. Webster BRAPP. Palmer amaranth, Amaranthus palmeri S. Wats. AMAPA, pitted morningglory, Ipomoea lacunosa L. IPOLA, prickly sida, Sida spinosa L. SIDSP, rice, Oryza sativa L. ‘CL 730’ ORYSASoil typetank-mixturewater conservation

Information

Type
Weed Management — Major Crops
Information
Weed Technology , Volume 22 , Issue 2 , June 2008 , pp. 217 - 221
Copyright
Copyright © Weed Science Society of America 

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