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Economics of Johnsongrass (Sorghum halepense) Control in Soybeans (Glycine max)

Published online by Cambridge University Press:  12 June 2017

William G. Johnson ,
Robert E. Frans  and
Lucas D. Parsch
William G. Johnson
Affiliation:
Dep. Agron. and Rur. Soc. Univ. Arkansas, Fayetteville, AR 72701
Robert E. Frans
Affiliation:
Dep. Agron. and Rur. Soc. Univ. Arkansas, Fayetteville, AR 72701
Lucas D. Parsch
Affiliation:
Dep. Agric. Econ. and Rur. Soc. Univ. Arkansas, Fayetteville, AR 72701
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Abstract

Field trials were conducted from 1986 to 1988 at Clarkedale, AR, to evaluate selective POST grass herbicides for johnsongrass control in soybeans. Herbicide treatments were trifluralin PPI followed by single and sequential POST applications of fenoxaprop, fluazifop, quizalofop, or sethoxydim. In 1986, sequential applications of sethoxydim and fenoxaprop controlled more johnsongrass 4 WAT than single treatments. In 1987 and 1988, all herbicides except fenoxaprop controlled more than 79% of johnsongrass. The number of johnsongrass stems was reduced by cultural practices and herbicides after 2 yr. The lowest cost of control and the highest average net return over the 3-yr period was obtained with quizalofop.

Keywords

Fenoxaprop, (±)-2-[4-[(6-chloro-2-benzoxazolyl)oxy]phenoxy]propanoic acidfluazifop-P, (R)-2-[4-[5-(trifluoromethyl)-2-pyridinyl-oxy]phenoxy]propanoic acidquizalofop, (±)-2-[4-[(6-chloro-2-quinoxalinyl)oxy]phenoxy]propanoic acidsethoxydim, 2-[1-(ethoxyimino)butyl-5-[2-(ethylthio)propyl]-3-hydroxy-2-cyclohexen-1-onetrifluralin, 2,6-dinitro-N,N-dipropyl-4-(trifluoromethyl)benzenamine, johnsongrass, Sorghum halepense (L.) Pers. ♯ SORHAsoybeans, Glycine max (L.) Merr. ‘Centennial’Economic analysisfenoxapropfluazifop-PquizalofopsethoxydimSORHA
Type
Research
Information
Weed Technology , Volume 5 , Issue 4 , December 1991 , pp. 765 - 770
Copyright
Copyright © 1990 by the Weed Science Society of America 

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References

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