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Johnsongrass (Sorghum halepense) Control in Soybeans (Glycine max) with Postemergence Grass Herbicides Applied Alone and in Mixtures

Published online by Cambridge University Press:  12 June 2017

Ted Whitwell ,
Glenn Wehtje ,
Robert H. Walker  and
John A. McGuire
Ted Whitwell
Affiliation:
Dep. Agron. and Soils, Auburn Univ., AL 36849
Glenn Wehtje
Affiliation:
Dep. Agron. and Soils, Auburn Univ., AL 36849
Robert H. Walker
Affiliation:
Dep. Agron. and Soils, Auburn Univ., AL 36849
John A. McGuire
Affiliation:
Alabama Agric. Exp. Stn., Auburn Univ., AL 36849
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Abstract

Sethoxydim {2-[1-(ethoxyimino)butyl]-5-[2-(ethylthio)propyl]-3-hydroxy-2-cyclohexen-1-one}, CGA-82725 {2-propynyl 2-[4-[(3,5-dichloro-2-pyridinyl)oxy]phenoxy]propanoate}, RO 13-8895 {acetone-O-[D-2-[p-(α,α,α-trifluoro-p-tolyl)oxy]phenoxy]propionyl oxime}, and difenopenten {4-[4-[4-(trifluoromethyl)phenoxy]phenoxy]-2-pentenoic acid} were evaluated as single and/or split applications for postemergence control of johnsongrass [Sorghum halepense (L.) Pers. ♯ SORHA] grown from rhizomes in soybeans [Glycine max (L.) Merr.]. Good to excellent control, crop safety, and yield enhancement were achieved with all herbicides evaluated. Antagonism between postemergence grass and broadleaf herbicides was evaluated by applying sethoxydim, CGA-82725, RO 13-8895, and difenopenten alone to soybeans infested with johnsongrass grown from seed, and applying these herbicides as mixtures with acifluorfen {5-[2-chloro-4-(trifluoromethyl)phenoxy]-2-nitrobenzoic acid}, bentazon [3-isopropyl-1H-2,1,3-benzothiadiazin-4(3H)-one 2,2-dioxide], or benazolin (4-chloro-2-oxobenzothiazolin-3-ylacetic acid). Acifluorfen was most antagonistic to the activity of postemergence grass herbicides, with difenopenten and sethoxydim the most susceptible to antagonism. Reductons in johnsongrass control were attributed to antagonism by broadleaf herbicides, which caused soybean yield reductions of up to 67%.

Keywords

Herbicide antagonismsethoxydimCGA 82725RO 13-8895difenopentenacifluorfenbentazonbenazolinSORHA
Type
Weed Control and Herbicide Technology
Information
Weed Science , Volume 33 , Issue 5 , September 1985 , pp. 673 - 678
Copyright
Copyright © 1985 by the Weed Science Society of America 

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References

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