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Grain Sorghum Response to Simulated Drift from Glufosinate, Glyphosate, Imazethapyr, and Sethoxydim1

Published online by Cambridge University Press:  20 January 2017

Kassim Al-Khatib ,
Mark M. Claassen ,
Phillip W. Stahlman ,
Patrick W. Geier ,
David L. Regehr ,
Stewart R. Duncan  and
William F. Heer
Kassim Al-Khatib*
Affiliation:
Department of Agronomy, Kansas State University, Manhattan, KS 66506
Mark M. Claassen
Affiliation:
Department of Agronomy, Kansas State University, Manhattan, KS 66506
Phillip W. Stahlman
Affiliation:
Department of Agronomy, Kansas State University, Manhattan, KS 66506
Patrick W. Geier
Affiliation:
Department of Agronomy, Kansas State University, Manhattan, KS 66506
David L. Regehr
Affiliation:
Department of Agronomy, Kansas State University, Manhattan, KS 66506
Stewart R. Duncan
Affiliation:
Department of Agronomy, Kansas State University, Manhattan, KS 66506
William F. Heer
Affiliation:
Department of Agronomy, Kansas State University, Manhattan, KS 66506
*
Corresponding author's E-mail: [email protected]
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Abstract

Field experiments were conducted at four locations in Kansas in 1999 and 2000 to evaluate grain sorghum response to simulated drift rates of four herbicides. Imazethapyr, glufosinate, glyphosate, and sethoxydim were applied at 1/3, 1/10, 1/33, and 1/100 of the use rate when plants were 10 to 20 cm tall. Visible crop injury increased as rates of each herbicide increased. Glyphosate and imazethapyr caused the most injury and glufosinate the least. Data show that some plants that were significantly injured 2 wk after treatment (WAT) recovered 8 WAT. However, some plants that received the highest rate of imazethapyr or glyphosate died. Grain sorghum yields were reduced only when injury was severe. This research showed that the potential for sorghum injury from off-target herbicide drift is greater from imazethapyr and glyphosate than from sethoxydim or glufosinate.

Keywords

Glufosinateglyphosateimazethapyrsethoxydimsorghum, Sorghum bicolor (L.) MoenchCrop injuryherbicide driftherbicide symptomsDAT, days after treatmentWAT, weeks after treatment
Type
Research
Information
Weed Technology , Volume 17 , Issue 2 , June 2003 , pp. 261 - 265
Copyright
Copyright © Weed Science Society of America 

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