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Differential Control of Four Amaranthus Species by Six Postemergence Herbicides in Soybean (Glycine max)

Published online by Cambridge University Press:  12 June 2017

Christopher M. Mayo ,
Michael J. Horak ,
Dallas E. Peterson  and
John E. Boyer
Christopher M. Mayo
Affiliation:
Dep. Agron., and Dep. Statistics, Kansas State Univ., Manhattan, KS 66506. Contribution #94-526-J from the Kansas Agric. Exp. Stn.
Michael J. Horak
Affiliation:
Dep. Agron., and Dep. Statistics, Kansas State Univ., Manhattan, KS 66506. Contribution #94-526-J from the Kansas Agric. Exp. Stn.
Dallas E. Peterson
Affiliation:
Dep. Agron., and Dep. Statistics, Kansas State Univ., Manhattan, KS 66506. Contribution #94-526-J from the Kansas Agric. Exp. Stn.
John E. Boyer
Affiliation:
Dep. Agron., and Dep. Statistics, Kansas State Univ., Manhattan, KS 66506. Contribution #94-526-J from the Kansas Agric. Exp. Stn.
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Abstract

Acifluorfen, lactofen, chlorimuron, thifensulfuron, imazethapyr, and imazaquin were evaluated for control of Palmer amaranth, common waterhemp, redroot pigweed, and tumble pigweed at three application timings in field and greenhouse experiments. Results from field studies indicated that most herbicides provided greater than 90% control of common waterhemp, redroot pigweed, and tumble pigweed regardless of time of application. Palmer amaranth was the most difficult species to control, and only thifensulfuron and imazethapyr provided greater than 80% control at all application timings. In the greenhouse experiment, herbicides were applied when pigweeds averaged 10 cm, 20 cm, and 30 cm in height. Results were similar to the field experiment, except that common waterhemp was more difficult to control.

Keywords

Acifluorfen, 5-[2-chloro-4-(trifluoromethyl)phenoxy]-2-nitrobenzoic acidcommon waterhemp, Amaranthus rudis Sauer # AMATAPalmer amaranth, Amaranthus palmeri S. Wats. # AMAPAredroot pigweed, Amaranthus retroflexus L. # AMAREsoybean Glycine max (L.) Merrtumble pigweed, Amaranthus albus L. # AMAALHerbicide efficacyacifluorfenchlorimuronimazaquinimazethapyrlactofenthifensulfuronAmaranthus rudisAmaranthus palmeriAmaranthus retroflexusAmaranthus albusAMAALAMAPAAMAREAMATA
Type
Research
Information
Weed Technology , Volume 9 , Issue 1 , March 1995 , pp. 141 - 147
Copyright
Copyright © 1995 by the Weed Science Society of America 

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References

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