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Glyphosate-resistant Horseweed (Conyza canadensis) Control Using Glyphosate-, Paraquat-, and Glufosinate-Based Herbicide Programs

Published online by Cambridge University Press:  20 January 2017

Thomas W. Eubank ,
Daniel H. Poston ,
Vijay K. Nandula ,
Clifford H. Koger ,
David R. Shaw  and
Daniel B. Reynolds
Thomas W. Eubank*
Affiliation:
Delta Research and Extension Center, Mississippi State University, Stoneville, MS 38776
Daniel H. Poston
Affiliation:
Delta Research and Extension Center, Mississippi State University, Stoneville, MS 38776
Vijay K. Nandula
Affiliation:
Delta Research and Extension Center, Mississippi State University, Stoneville, MS 38776
Clifford H. Koger
Affiliation:
Delta Research and Extension Center, Mississippi State University, Stoneville, MS 38776
David R. Shaw
Affiliation:
Department of Plant and Soil Sciences, Mississippi State University, Mississippi State, MS 39762
Daniel B. Reynolds
Affiliation:
Department of Plant and Soil Sciences, Mississippi State University, Mississippi State, MS 39762
*
Corresponding author's E-mail: [email protected]
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Abstract

Field studies were conducted in 2005 and 2006 to determine the most effective chemical options within three individual herbicide-based burndown programs, glyphosate, paraquat and glufosinate, for controlling glyphosate-resistant horseweed in Mississippi. Burndown treatments were applied April 5, 2005 and March 15, 2006 to horseweed plants 15 to 30 cm in height. Glyphosate at 0.86 kg ae/ha alone provided 60 to 65% horseweed control 4 wk after treatment (WAT). Control 4 WAT ranged from 73 to 74% when the glyphosate rate was increased to 1.25 kg/ha. Glyphosate at 0.86 kg/ha applied in combination with 2,4-D at 0.84 kg ae/ha or dicamba at 0.28 ae/ha maximized control of horseweed (≥ 90%) 4 WAT and soybean yield. Horseweed control 4 WAT with paraquat alone at 0.84 kg ai/ha ranged from 55 to 63% and control did not improve by increasing the rate to 0.98 kg/ha. Addition of 2,4-D or dicamba to paraquat maximized horseweed control both years (78 to 89%), whereas soybean yield was maximized with addition of dicamba or metribuzin at 0.42 kg ai/ha. Glufosinate applied alone at 0.47 kg ai/ha resulted in at least 88% control of horseweed and maximized soybean yield. Results indicate that effective management of glyphosate-resistant horseweed can be obtained in glyphosate-resistant soybean in glyphosate-, paraquat-, and glufosinate-based preplant weed control programs.

Keywords

Carfentrazonechlorimuron2,4-Ddicambaflumioxazinglufosinateglyphosatelinuronmetribuzinoxyfluorfenparaquatthifensulfurontribenuronhorseweed, Conyza canadensis (L.) Cronq. ERICAsoybean, Glycine max. (L.) Merr. DK 4763RR, AG 4801RRBurndownglyphosate resistanceherbicide efficacyherbicide mixturesplant densityweed resistanceyield reduction
Type
Research
Information
Weed Technology , Volume 22 , Issue 1 , March 2008 , pp. 16 - 21
Copyright
Copyright © Weed Science Society of America 

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