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Weed Control with Reduced Rates of Chlorimuron Plus Metribuzin and Imazethapyr in No-Till Narrow-Row Soybean (Glycine max)

Published online by Cambridge University Press:  12 June 2017

William G. Johnson ,
Jeffrey S. Dilbeck ,
Michael S. Defelice  and
J. Andrew Kendig
William G. Johnson
Affiliation:
Department of Agronomy, University of Missouri, Columbia, MO 65203
Jeffrey S. Dilbeck
Affiliation:
Department of Agronomy, University of Missouri, Columbia, MO 65203
Michael S. Defelice
Affiliation:
Department of Agronomy, University of Missouri, Columbia, MO 65203
J. Andrew Kendig
Affiliation:
Department of Agronomy, University of Missouri, Columbia, MO 65203
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Abstract

Field studies were conducted at three locations in 1993 and 1994 to evaluate weed control and crop response to combinations of glyphosate, metolachlor, 0.5 X and 1 X label rates of chlorimuron plus metribuzin applied prior to planting (PP), and 0.5 X and 1 X label rates of imazethapyr applied early postemergence (EPOST) or postemergence (POST) in no-till narrow-row soybean production. Giant foxtail densities were reduced with sequential PP followed by (fb) EPOST or POST treatments. Large crabgrass was reduced equivalently with all herbicide combinations involving chlorimuron plus metribuzin PP fb imazethapyr. Common cocklebur control was variable but was usually greater with treatments that included imazethapyr. Ivyleaf morningglory densities were not reduced with any herbicide combinations. Sequential PP fb EPOST or POST treatments tended to provide slightly better weed suppression than PP-only treatments, but the difference was rarely significant. Soybean yields with treatments utilizing 0.5 X rates were usually equal to 1 X rates.

Keywords

Chlorimuron, 2-[[[[(4-chloro-6-methoxy-2-pyrimidinyl)amino]carbonyl]amino]sulfonyl] benzoic acidglyphosate, N-(phosphonomethyl)glycinemetolachlor, (2-chloro-N-(2-ethyl-6-methylphenyl)-N-(2-methoxy-1-methylethyl)acetamide)metribuzin, 4-amino-6-(1,1-dimethylethyl)-3-(methylthio)-1,2,4-triazin-5(4H)-oneimazethapyr, 2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-5-ethyl-3-pyridinecarboxylic acidcommon cocklebur, Xanthium strumarium # XANSTgiant foxtail, Setaria faberi L. # SETFAivyleaf morningglory, Ipomoea hederacea L. # IPOHElarge crabgrass, Digitaria sanguinalis # DIGSAsoybean, Glycine max (L.) Merr. ‘Pioneer 9381,’‘Pioneer 9443,’‘As-grow 5560.’DIGSAIPOHESETFAXANSTEPOST, early postemergencefb, followed byPOST, postemergencePP, prior to planting
Type
Research
Information
Weed Technology , Volume 12 , Issue 1 , March 1998 , pp. 32 - 36
Copyright
Copyright © 1997 by the Weed Science Society of America 

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