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Weed Control in Soybeans (Glycine max) with Reduced Rates of Postemergence Herbicides

Published online by Cambridge University Press:  12 June 2017

Michael S. Defelice ,
William B. Brown ,
Richard J. Aldrich ,
Barry D. Sims ,
Dan T. Judy  and
David R. Guethle
Michael S. Defelice
Affiliation:
Agron. Dep., Univ. Missouri, Columbia, MO 65211
William B. Brown
Affiliation:
Agron. Dep., Univ. Missouri, Columbia, MO 65211
Richard J. Aldrich
Affiliation:
U.S. Dep. Agric., Agric. Res. Serv., Agron. Dep., Univ. Missouri, Columbia, MO 65211
Barry D. Sims
Affiliation:
Agron. Dep., Univ. Missouri, Delta Center, Portageville, MO 63873
Dan T. Judy
Affiliation:
U.S. Dep. Agric., Agric. Res. Serv., Agron. Dep., Univ. Missouri, Columbia, MO 65211
David R. Guethle
Affiliation:
Agron. Dep., Univ. Missouri, Delta Center, Portageville, MO 63873
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Abstract

Field studies were conducted at three sites in Missouri in 1986 and 1987 to evaluate the performance of below-label rates of bentazon, acifluorfen, and chlorimuron tank mixed with sethoxydim and applied to soybeans 7 and 14 days after planting to evaluate broadleaf and grass weed control and weed seed production. Sequential applications of 0.25X-labeled rates of all three broadleaf herbicides tank mixed with 0.5X sethoxydim rates controlled giant foxtail, velvetleaf, and common cocklebur equivalent to one application of standard-labeled rates of the same tank mixes. Single applications of below-labeled rates of the postemergence herbicides did not control weeds, and soybean yields were not equal to sequential 0.25X or single full-rate treatments. A preemergence treatment of clomazone plus imazaquin applied at labeled rates controlled weeds, and soybean yields were equal to a handweeded check in both years at all test locations. Weeds survived and produced seed to reinfest the plots the following year unless nearly 100% control was achieved.

Keywords

Acifluorfen, 5-[2-chloro-4-(trifluoromethyl)phenoxyl]-2-nitrobenzoic acidbentazon, 3-(1-methylethyl)-(1H)-2,1,3-benzothiadiazin-4(3H)-one 2,2-dioxidechlorimuron, 2- [[[[(4-chloro-6-methoxy-2-pyrimidinyl)amino carbonyl] amino] sulfonyl] benzoic acidclomazone, 2-[(2-chlorophenyl)methyl]-4,4-dimethyl-3-isoxazolidinoneimazaquin, 2- [4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-3-quinolinecarboxylic acidsethoxydim, 2-[1-(ethoxyimino)butyl]-5-[2-(ethylthio)propyl]-3-hydroxy-2-cyclohexen-1-onecommon cocklebur, Xanthium strumarium L. ♯3 XANSTgiant foxtail, Setaria faberii Herrm. ♯ SETFA: soybeans, Glycine max (L.) Merr. ‘Williams 82′velvetleaf, Abutilon theophrasti Medik. ♯ ABUTH.Acifluorfenbentazonchlorimuronclomazoneimazaquinsethoxydimpreemergenceweed seedweed biologyABUTHDIGSAIPOLAPANDISETFAXANST
Type
Weed Control and Herbicide Technology
Information
Weed Science , Volume 37 , Issue 3 , May 1989 , pp. 365 - 374
Copyright
Copyright © 1989 by the Weed Science Society of America 

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References

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