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Effect of Delayed Dicamba plus Glufosinate Application on Palmer Amaranth (Amaranthus palmeri) Control and XtendFlex™ Cotton Yield

Published online by Cambridge University Press:  06 September 2017

Rachel A. Vann ,
Alan C. York ,
Charles W. Cahoon Jr. ,
Trace B. Buck ,
Matthew C. Askew  and
Richard W. Seagroves
Rachel A. Vann*
Affiliation:
Graduate Research Assistant, William Neal Reynolds Professor Emeritus, Undergraduate Assistant, Undergraduate Assistant, and Research Specialist, Crop and Soil Sciences Department, Box 7620, North Carolina State University, Raleigh, NC 27695-7620
Alan C. York
Affiliation:
Graduate Research Assistant, William Neal Reynolds Professor Emeritus, Undergraduate Assistant, Undergraduate Assistant, and Research Specialist, Crop and Soil Sciences Department, Box 7620, North Carolina State University, Raleigh, NC 27695-7620
Charles W. Cahoon Jr.
Affiliation:
Assistant Professor, Eastern Shore Agricultural Research and Extension Center, Virginia Tech, Painter, VA 23240
Trace B. Buck
Affiliation:
Graduate Research Assistant, William Neal Reynolds Professor Emeritus, Undergraduate Assistant, Undergraduate Assistant, and Research Specialist, Crop and Soil Sciences Department, Box 7620, North Carolina State University, Raleigh, NC 27695-7620
Matthew C. Askew
Affiliation:
Graduate Research Assistant, William Neal Reynolds Professor Emeritus, Undergraduate Assistant, Undergraduate Assistant, and Research Specialist, Crop and Soil Sciences Department, Box 7620, North Carolina State University, Raleigh, NC 27695-7620
Richard W. Seagroves
Affiliation:
Graduate Research Assistant, William Neal Reynolds Professor Emeritus, Undergraduate Assistant, Undergraduate Assistant, and Research Specialist, Crop and Soil Sciences Department, Box 7620, North Carolina State University, Raleigh, NC 27695-7620
*
*Corresponding author’s E-mail: [email protected]
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Abstract

Glufosinate controls glyphosate-resistant Palmer amaranth, but growers struggle to make timely applications. XtendFlexTM cotton, resistant to dicamba, glufosinate, and glyphosate, may provide growers an option to control larger weeds. Palmer amaranth control and cotton growth, yield, and fiber quality were evaluated in a rescue situation created by delaying the first POST herbicide application. Treatments consisted of two POST applications of dicamba plus glufosinate, separated by 14 d, with the first application timely (0-d delay) or delayed 7, 14, 21, or 28 d. All treatments included a layby application of diuron plus MSMA. Palmer amaranth, 14 d after first POST, was controlled 99, 96, 89, 75, and 73% with 0-, 7-, 14-, 21-, or 28-d delays, respectively. Control increased following the second application, and the weed was controlled at least 94% following layby. Cotton yield decreased linearly as first POST application was delayed, with yield reductions ranging from 8 to 42% with 7- to 28-d delays. Delays in first POST application delayed cotton maturity but did not affect fiber quality.

Keywords

DicambaglufosinateglyphosatePalmer amaranth, Amaranthus palmeri S. Watscotton, Gossypium hirsutum L.Cotton fiber qualitycotton injurycotton maturityearly-season weed competitionplant mappingrescue applicationweed biomass
Type
Weed Management-Major Crops
Information
Weed Technology , Volume 31 , Issue 5 , October 2017 , pp. 633 - 640
Copyright
© Weed Science Society of America, 2017 

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Footnotes

Associate Editor for this paper: Daniel Stephenson, Louisana State University Agricultural Center.

References

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