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Weed Control in Wide- and Narrow-Row Soybean (Glycine max) with Imazamox, Imazethapyr, and CGA-277476 plus Quizalofop

Published online by Cambridge University Press:  12 June 2017

Kelly A. Nelson  and
Karen A. Renner
Kelly A. Nelson
Affiliation:
Department of Crop and Soil Sciences, Michigan State University, East Lansing, MI 48824-1325
Karen A. Renner
Affiliation:
Department of Crop and Soil Sciences, Michigan State University, East Lansing, MI 48824-1325
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Abstract

Field experiments were conducted at East Lansing and Clarksville, MI, to evaluate the efficacy of imazamox, imazethapyr, and CGA-277476 plus quizalofop applied postemergence in wide- (76-cm) and narrow- (19-cm) row soybean. Soybean injury from all herbicides was minimal 14 days after treatment (DAT), except for CGA-277476 at 79 g ai/ha plus 69 g ai/ha quizalofop, which caused 30% soybean injury at the Clarksville location. Adding 4 g ai/ha CGA-248757 to 65 g ai/ha CGA-277476 plus quizalofop reduced common ragweed control, but increased redroot pigweed control in wide rows compared to 79 g ai/ha CGA-277476 plus quizalofop. Imazamox at 35 and 45 g ai/ha provided greater common ragweed and common lambsquarters control than imazethapyr at 70 g ai/ha 28 DAT. All herbicide treatments controlled velvetleaf. Common ragweed and common lambsquarters control by all herbicide treatments was enhanced in narrow- compared to wide-row soybean 56 DAT as was redroot pigweed control by CGA-277476 treatments. Total weed biomass and soybean yield in wide-row soybean treated with imazamox at 45 g/ha was not different from the hand-weeded control. In narrow-row soybean, soybean yield was equal to the hand-weeded control for 35 and 45 g/ha imazamox and 70 g/ha imazethapyr. Postemergence herbicide treatments resulted in less weed biomass and greater soybean yield in narrow- compared to wide-row soybean.

Keywords

CGA-248757 (proposed fluthiacet-methyl), methyl [[2-chloro-4-fluoro-5-[(tetrahydro-3-oxo-1H, 3H-[1,3,4]thiadiazolo[3,4-a]pyridazin-1-ylidene)amino]phenyl]thio]acetateimazamox, 2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-5-(methoxymethyl)-3-pyridinecarboxylic acidimazethapyr, 2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-5-ethyl-3-pyridinecarboxylic acidCGA-277476 (proposed oxasulfuron), 2-[[[[(4,6-dimethyl-2-pyrimidinyl)-amino]carbonyl]amino]sulfonyl] benzoic acid, 3-oxetanyl esterquizalofop, (±)-2-[4-[(6-chloro-2-quinoxalinyl)oxy]phenoxy]propanoic acidcommon lambsquarters, Chenopodium album L. # CHEALcommon ragweed, Ambrosia artemisiifolia L. # AMBELredroot pigweed, Amaranthus retroflexus L. # AMAREvelvetleaf, Abutilon theophrasti Medik. # ABUTHsoybean, Glycine max (L.) MerrPostemergencerow spacingABUTHAMAREAMBELCHEALDAT, days after treatmentMSO, methylated seed oilNIS, nonionic surfactantUAN, 28&percnturea ammonium nitrate
Type
Research
Information
Weed Technology , Volume 12 , Issue 1 , March 1998 , pp. 137 - 144
Copyright
Copyright © 1997 by the Weed Science Society of America 

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