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Effect of AC 263,222, Imazethapyr, and Nicosulfuron on Weed Control and Imidazolinone-Tolerant Corn (Zea mays) Yield

Published online by Cambridge University Press:  12 June 2017

C. Dale Monks ,
John W. Wilcut ,
John S. Richburg ,
Joseph H. Hatton  and
Michael G. Patterson
C. Dale Monks
Affiliation:
Dep. Agron. and Soils and Alabama Agric. Exp. Stn., Auburn Univ., Auburn, AL 36849
John W. Wilcut
Affiliation:
Dep. Crop Sci., N.C. State Univ., Raleigh, NC 27695-7620
John S. Richburg
Affiliation:
Univ. Georgia, Tifton, GA 37193
Joseph H. Hatton
Affiliation:
State Soil Conserv., Kingwood, WV 26537
Michael G. Patterson
Affiliation:
Dep. Agron. and Soils and Alabama Agric. Exp. Stn., Auburn Univ., Auburn, AL 36849
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Abstract

Imidazolinone herbicides injure currently available commercial field corn cultivars; however, cultivars resistant to these herbicides have been developed. Sicklepod, Texas panicum, and annual morningglory control using AC 263,222 (36 and 72 g ai/ha), imazethapyr (36 and 72 g ai/ha), or nicosulfuron (35 g ai/ha) applied POST at 2,4, and 6 wk after planting were evaluated in imidazolinone-tolerant corn. Studies were conducted at Attapulgus and Plains, Georgia from 1992 through 1993. Nicosulfuron and AC 263,222 at 72 g/ha controlled Texas panicum at least 87% when applied 2 wk after planting. Imazethapyr did not consistently control Texas panicum or sicklepod, regardless of application rate. AC 263,222 at both rates and nicosulfuron controlled sicklepod at least 86% when applied 2 wk after planting; however, later application or application under dry conditions generally resulted in reduced control. All herbicides controlled the entireleaf and pitted morningglory complex at least 84% when applied 2 wk after planting. Imidazolinone-tolerant corn was tolerant to all herbicides, regardless of rate and timing, and generally yielded greater when weeds were controlled early in the season.

Keywords

AC 263,222, (±)-2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-5-methyl-3-pyridinecarboxylicacidimazethapyr, 2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-5-ethyl-3-pyridinecarboxylic acidnicosulfuron, 2-[[[[(4,6-dimethoxy-2-pyrimidinyl)-amino]carbonyl]amino]sulfonyl]-N,N-dimethyl-3-pyridinecarboxamideentireleaf morningglory, Ipomoea hederacea var. integriuscula Gray # IPOHGpitted morningglory, Ipomoea lacunosa L. # IPOLAsicklepod, Senna obtusifolia (L.) Irwin and Barneby # CASOBTexas panicum, Panicum texanum Buckl. # PANTEcorn, Zea mays L., ‘Pioneer 3343IR.’Application timingherbicide-tolerant cropssulfonylurea herbicidesCASOBIPOHGIPOLAPANTE
Type
Research
Information
Weed Technology , Volume 10 , Issue 4 , December 1996 , pp. 822 - 827
Copyright
Copyright © 1996 by the Weed Science Society of America 

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