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Survey of Winter Wheat (Triticum aestivum) Stubble Fields Sprayed with Herbicides in 1998: Weed Control

Published online by Cambridge University Press:  20 January 2017

Gail A. Wicks ,
Don H. Popken ,
Garold W. Mahnken ,
Gordon E. Hanson  and
Drew J. Lyon
Gail A. Wicks*
Affiliation:
Department of Agronomy, University of Nebraska, North Platte, NE 69101
Don H. Popken
Affiliation:
United Suppliers, Inc., North Platte, NE 69101
Garold W. Mahnken
Affiliation:
University of Nebraska, North Platte, NE 69101
Gordon E. Hanson
Affiliation:
University of Nebraska, North Platte, NE 69101
Drew J. Lyon
Affiliation:
Department of Agronomy, Scottsbluff, NE 69361
*
Corresponding author's E-mail: gwicks1@unl.edu
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Abstract

A survey of 174 fields was conducted to investigate performance of herbicides applied after winter wheat harvest on weeds across western and southern Nebraska during August and September 1998. Glyphosate plus 2,4-D plus atrazine was applied on 32%, glyphosate plus 2,4-D or dicamba on 24%, paraquat plus atrazine on 23%, glyphosate on 8%, ICIA0224 plus 2,4-D or atrazine on 10%, and atrazine plus 2,4-D on 3% of the fields. These treatments controlled 85 to 100% of the weeds except atrazine plus 2,4-D, which controlled 30%. The frequency of occurrence of the most prevalent summer annual grasses was as follows: green foxtail, 65%; barnyardgrass, 46%; stinkgrass, 41%; witchgrass, 39%; and longspine sandbur, 36%. The most common broadleaf weeds and their frequency were redroot pigweed, 32%; tumble pigweed, 30%; tall waterhemp, 28%; and kochia, 25%. Virginia groundcherry, 22%; common milkweed, 11%; yellow woodsorrel, 9%; and field bindweed, 6% were the most common perennial weeds. The five most difficult weeds to control were yellow nutsedge, spotted spurge, Virginia groundcherry, common milkweed, and toothed spurge, with control ratings of 0, 3, 17, 26, and 33%, respectively. These weeds were not controlled with glyphosate or mixtures containing glyphosate. Only 35% of the fields were treated before summer annual grasses had headed. Late applications required higher herbicides rates for effective control.

Keywords

Atrazine2,4-DdicambaglyphosateICIA0224 (glyphosate trimethylsulfonium salt)paraquatcommon milkweed, Asclepias syriaca L. # ASCYSfield bindweed, Convolvulus arvensis L. # CONARgreen foxtail, Setaria viridis (L.) Beauv. # SETVIkochia, Kochia scoparia (L.) Schrad # KCHSCredroot pigweed, Amaranthus retroflexus L. # AMAREspotted spurge, Euphorbia maculata L. # EPHMAtoothed spurge, Euphorbia dentata Michx. # EPHDEtumble pigweed, Amaranthus albus L. # AMAALVirginia groundcherry, Physalis virginiana Mill. # PHYLCwitchgrass, Panicum capillare L. # PANCAyellow nutsedge, Cyperus esculentus L. # CYPESyellow woodsorrel, Oxalis stricta L. # OXASTwinter wheat, Triticum aestivum L.AMAALAMAREatrazineconservation tillageCYPES2,4-DdicambaECHCGecofallowecofarmingERACNglyphosateKCHSCKSHSCno-tillOXASTPANCAparaquatSETVIweed management
Type
Research
Information
Weed Technology , Volume 17 , Issue 3 , September 2003 , pp. 475 - 484
Copyright
Copyright © Weed Science Society of America 

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Footnotes

1 Publication 13602 University of Nebraska Agriculture Research Division, Lincoln, NE 68583, Journal Series.

References

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