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Herbicide Efficacy on Four Amaranthus Species in Soybean (Glycine max)

Published online by Cambridge University Press:  12 June 2017

Jonathan K. Sweat ,
Michael J. Horak ,
Dallas E. Peterson ,
Randy W. Lloyd  and
John E. Boyer
Jonathan K. Sweat
Affiliation:
Kansas State University, Manhattan, KS 66502
Michael J. Horak
Affiliation:
Kansas State University, Manhattan, KS 66502
Dallas E. Peterson
Affiliation:
Kansas State University, Manhattan, KS 66502
Randy W. Lloyd
Affiliation:
American Cyanamid Co., Williamsburg, KS 66095
John E. Boyer
Affiliation:
Kansas State University, Manhattan, KS 66502
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Abstract

Field and greenhouse studies were conducted in 1995 and 1996 in Kansas to determine the efficacy of 21 herbicide treatments for control of tumble pigweed, Palmer amaranth, redroot pigweed, and two biotypes of common waterhemp in soybean. In field studies, nine of eleven preemergence treatments controlled all four species 90% or more. However, pendimethalin and trifluralin controlled Palmer amaranth, redroot pigweed, and tumble pigweed less than the other preplant incorporated and preemergence treatments. With the exception of flumiclorac and NAF-75, postemergence treatments controlled 75 to 90% of all four species. A biotype of common waterhemp collected in Iowa was not controlled by acetolactate synthase-inhibiting herbicides. Greenhouse results were similar to field experiments. Results suggest at least 90% control of these Amaranthus species is possible with proper herbicide selection.

Keywords

Flumiclorac, [2-chloro-4-fluoro-5-(1,3,4,5,6,7-hexahydro-1,3-dioxo-2H-isoindol-2-yl)phenoxy]acetic acidNAF-75, N-2(2-carboxymethyl-6-chlorophenyl)-5-ethoxy-7-fluoro(1,2,4)triazolo-(1,5c)-pyrimidine-2-sulfonamidependimethalin, N-(1-ethylpropyl)-3,4-dimethyl-2,6-dinitrobenzenaminetrifluralin, 2,6-dinitro-N,N-dipropyl-4-(trifluoromethyl) benzenaminecommon waterhemp, Amaranthus rudis Sauer #3 AMATAPalmer amaranth, Amaranthus palmeri S. Wats. # AMAPAredroot pigweed, Amaranthus retroflexus L. # AMAREtumble pigweed, Amaranthus albus L. # AMAALsoybean, Glycine max (L.) Merr.AcetochloracifluorfenalachlorSAN 582fomesafenimazamoximazaquinimazethapyrlactofenmetolachlormetribuzinsulfentrazonethifensulfuronALS, acetolactate synthaseDAT, days after treatmentPOST, postemergencePPI, preplant incorporatedPRE, preemergence
Type
Research
Information
Weed Technology , Volume 12 , Issue 2 , June 1998 , pp. 315 - 321
Copyright
Copyright © 1998 by the Weed Science Society of America 

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References

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