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Wheat Response to Simulated Glyphosate Drift

Published online by Cambridge University Press:  20 January 2017

Christopher A. Roider ,
James L. Griffin ,
Stephen A. Harrison  and
Curtis A. Jones
Christopher A. Roider
Affiliation:
Louisiana State University Agricultural Center, Central Research Station Plant Science Unit and Farm Support Unit, Baton Rouge, LA 70803
James L. Griffin*
Affiliation:
Department of Agronomy and Environmental Management, Louisiana State University Agricultural Center, 104 Sturgis Hall, Baton Rouge, LA 70803
Stephen A. Harrison
Affiliation:
Department of Agronomy and Environmental Management, Louisiana State University Agricultural Center, 104 Sturgis Hall, Baton Rouge, LA 70803
Curtis A. Jones
Affiliation:
Department of Agronomy and Environmental Management, Louisiana State University Agricultural Center, 104 Sturgis Hall, Baton Rouge, LA 70803
*
Corresponding author's E-mail: jgriffin@agcenter.lsu.edu
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Abstract

Glyphosate at simulated drift rates representing 12.5, 6.3, and 1.6% of the usage rate of 1,120 g ai/ha (140, 70, and 18 g/ha, respectively) was applied to wheat at first node, boot stage, or at early flowering. At 14 d after treatment (DAT) wheat injury, expressed as bleaching of leaf foliage and growth inhibition, was 40 to 55% for 70 g/ha applied at first node and for 140 g/ha applied at all growth stages. Wheat height 28 DAT was reduced 47% with glyphosate applied at 140 g/ha at first node and was reduced around 26% for 70 g/ha applied at first node and 140 g/ha applied at boot stage. Wheat height was not reduced with glyphosate at 18 g/ha applied at first node or boot stage and with all rates applied at early flowering. Wheat yield was reduced 72% when glyphosate was applied at 140 g/ha at first node, 45% when applied at boot stage, and 54% when applied at early flowering. For 70 g/ha, wheat yield was reduced 25 to 30% for the three application timings. Wheat yield was not reduced for 18 g/ha glyphosate. In another study, six wheat varieties responded the same to glyphosate applied at 140 and 70 g/ha. Wheat height 28 DAT was reduced an average of 34% for 140 g/ha glyphosate and 17% for 70 g/ha applied at first node, but height was not reduced when applied at early flowering. Yield was reduced an average of 58 and 43% for 140 and 70 g/ha applied at first node and 38 and 19% for 140 and 70 g/ha applied at early flowering. In both studies yield reductions in most cases were reflected in reduced spike density, spikelet number per spike, and seed weight.

Keywords

Glyphosatewheat, Triticum aestivum L. ‘Coker 9663’, ‘Mason’, ‘LA 422’, ‘AGS 2000’, ‘Pioneer/26R61’, and ‘USG 3209’Crop injuryherbicide driftoff-target movementwheat yield components
Type
Research
Information
Weed Technology , Volume 21 , Issue 4 , December 2007 , pp. 1010 - 1015
Copyright
Copyright © Weed Science Society of America 

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