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Weed Control from Herbicide Combinations with Three Formulations of Glyphosate

Published online by Cambridge University Press:  20 January 2017

Justin L. Norris ,
David R. Shaw  and
Charles E. Snipes
Justin L. Norris
Affiliation:
Department of Plant and Soil Sciences, Mississippi State University, Mississippi State, MS 39762
David R. Shaw*
Affiliation:
Department of Plant and Soil Sciences, Mississippi State University, Mississippi State, MS 39762
Charles E. Snipes
Affiliation:
Mississippi Agricultural and Forestry and Experiment Station, Delta Branch, Stoneville, MS 38776
*
Corresponding author's E-mail: [email protected].
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Abstract

Greenhouse studies were conducted to evaluate weed control from various formulations of glyphosate alone and in combination with postemergence herbicides. Tank mixtures did not increase barnyardgrass control 2 wk after treatment (WAT) when compared with glyphosate alone; however, tank mixtures did reduce barnyardgrass fresh weight 4 WAT when compared with glyphosate alone in several instances. Antagonism was observed when chlorimuron was combined with all formulations of glyphosate 4 WAT, but control was not reduced when compared with glyphosate alone. Selective herbicides added to glyphosate had an additive or antagonistic effect on prickly sida fresh-weight reductions. Antagonism of pitted morningglory fresh-weight reductions occurred when glyphosate was combined with all herbicides except acifluorfen, which had an additive effect. Fomesafen or lactofen effectively controlled hemp sesbania 2 WAT without the addition of glyphosate. Acifluorfen and chlorimuron combined with glyphosate Cheminova, Monsanto, or Zeneca reduced hemp sesbania fresh weight nearly twofold more than glyphosate alone.

Keywords

Acifluorfenchlorimuronfomesafenglyphosatelactofenbarnyardgrass, Echinochloa crus-galli (L.) Beauv. # ECHCGhemp sesbania, Sesbania exaltata (Raf.) Rydb. ex. A. W. Hill # SEBEXpitted morningglory, Ipomea lacunosa L. # IPOLAprickly sida, Sida spinosa L. # SIDSPAdditive effectsantagonismreduced ratessynergismALS, acetolactase synthaseC, CheminovaLSD, least significance differenceM, MonsantoPOST, postemergenceWAT, weeks after treatmentZ, Zeneca
Type
Research
Information
Weed Technology , Volume 15 , Issue 3 , September 2001 , pp. 552 - 558
Copyright
Copyright © Weed Science Society of America 

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References

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