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Second-generation Glyphosate-Resistant Cotton Tolerance to Combinations of Glyphosate with Insecticides and Mepiquat Chloride

Published online by Cambridge University Press:  20 January 2017

Donnie K. Miller ,
Jimmy X. Zumba ,
David C. Blouin ,
Ralph Bagwell ,
Eugene Burris ,
Ernest L. Clawson ,
B. Roger Leonard ,
Derek M. Scroggs ,
Alexander M. Stewart  and
P. Roy Vidrine
Donnie K. Miller*
Affiliation:
Northeast Research Station, LSU AgCenter, P.O. Box 438, St. Joseph, LA 71366
Jimmy X. Zumba
Affiliation:
School of Plant, Environmental, and Soil Sciences, LSU AgCenter, 104 Sturgis Hall, Baton Rouge, LA 70803
David C. Blouin
Affiliation:
Department of Experimental Statistics, LSU AgCenter, 161 Ag. Admin. Bldg., Baton Rouge, LA 70803
Ralph Bagwell
Affiliation:
Tom H. Scott Research and Extension Education Center, LSU AgCenter, 212 B Macon Ridge Rd., Winnsboro, LA 71295
Eugene Burris
Affiliation:
Northeast Research Station, LSU AgCenter, P.O. Box 438, St. Joseph, LA 71366
Ernest L. Clawson
Affiliation:
Northeast Research Station, LSU AgCenter, P.O. Box 438, St. Joseph, LA 71366
B. Roger Leonard
Affiliation:
Macon Ridge Research Station, LSU AgCenter, 212 A Macon Ridge Rd., Winnsboro, LA 71295
Derek M. Scroggs
Affiliation:
Dean Lee Research Station, 8105 Tom Bowman Dr., Alexandria, LA 71302
Alexander M. Stewart
Affiliation:
Dean Lee Research Station, 8105 Tom Bowman Dr., Alexandria, LA 71302
P. Roy Vidrine
Affiliation:
Dean Lee Research Station, 8105 Tom Bowman Dr., Alexandria, LA 71302
*
Corresponding author's E-mail: [email protected]
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Abstract

Field trials were conducted in 2005 and 2006 to evaluate application of glyphosate alone or plus the plant growth regulator mepiquat chloride with 20 different insecticides to second-generation glyphosate-resistant cotton at the pinhead square or first bloom growth stages. At 7 DAT, averaged across cotton growth stages and herbicide treatments, combination with insecticides profenofos and methomyl resulted in 5 and 9% plant injury, respectively, and were the only insecticide combinations that resulted in injury greater than glyphosate or glyphosate plus mepiquat chloride applied alone. By 14 DAT, cotton injury was less than 2% for all treatments. Averaged across cotton growth stages and insecticides, addition of mepiquat chloride to glyphosate resulted in a 4 and 6 cm height reduction at 7 and 28 DAT, respectively. Seed cotton yield and percent first harvest were similar for all treatments, indicating that cotton injury and height reductions observed after application did not result in yield reductions or maturity delays. Glyphosate combined with insecticides and mepiquat chloride, in accordance with herbicide labeling for second-generation glyphosate-resistant cotton, offers producers the ability to integrate pest and crop management strategies and reduce application costs with minimal effect on the crop.

Keywords

Acephateacetamipridbifenthrincyfluthrincypermethrindicrotophosdimethoateemamectin benzoategamma-cyhalothringlyphosateimidaclopridindoxacarblambda-cyhalothrinmepiquat chloridemethomylnovaluronoxamylprofenofosspinosadthiamethoxamthiodicarbzeta-cypermethrincotton, Gossypium hirsutum L.Crop toleranceherbicide–insecticide–mepiquat chloride coapplicationpesticide compatibility
Type
Research
Information
Weed Technology , Volume 22 , Issue 1 , March 2008 , pp. 81 - 85
Copyright
Copyright © Weed Science Society of America 

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References

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