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Glyphosate Efficacy on Selected Weed Species Is Unaffected by Chemical Coapplication

Published online by Cambridge University Press:  20 January 2017

Derek M. Scroggs ,
Donnie K. Miller ,
James L. Griffin ,
James P. Geaghan ,
P. Roy Vidrine  and
Alexander M. Stewart
Derek M. Scroggs*
Affiliation:
Dean Lee Research Station, 8105 Tom Bowman Dr., Alexandria, LA 71302
Donnie K. Miller
Affiliation:
Northeast Research Station, LSU AgCenter, P.O. Box 438, St. Joseph, LA 71366
James L. Griffin
Affiliation:
Department of Agronomy, 104 Sturgis Hall, Baton Rouge, LA 70803
James P. Geaghan
Affiliation:
Department of Experimental Statistics, LSU AgCenter, 161 Agriculture Administration Building, Baton Rouge, LA 70803
P. Roy Vidrine
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
*
Corresponding author's E-mail: dscroggs@agctr.lsu.edu
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Abstract

A study was conducted in 2004 to determine the effect of coapplication of the insecticides acephate, acetamiprid, bifenthrin, cyfluthrin, cypermethrin, dicrotophos, dimethoate, emanectin benzoate, imidacloprid, indoxacarb, lambda-cyhalothrin, methoxyfenozide, spinosad, thiamethoxam, and zeta-cypermethrin; the plant growth-regulator mepiquat pentaborate; a foliar sodium calcium borate micronutrient solution; and a foliar nitrogen fertilizer solution with glyphosate on the efficacy of weeds that commonly infest cotton. Barnyardgrass, hemp sesbania, johnsongrass, pitted morningglory, and sicklepod were grown in outdoor containers and treated with glyphosate at 1,120 g ai/ha alone or in coapplication at the three-to four- or seven-to eight-leaf growth stage. Glyphosate efficacy, based on visual control ratings at 7, 14, and 28 d after treatment (DAT) and fresh weight reduction of weed biomass at 28 DAT, was unaffected by chemical coapplication or application timing. Averaged across application timing and visual rating interval, glyphosate alone controlled barnyardgrass 97%, hemp sesbania 68%, johnsongrass 98%, pitted morningglory 68%, and sicklepod 89%. These results indicate that glyphosate coapplications evaluated offer producers the ability to combine pest and crop management strategies and reduce application costs without sacrificing control of weeds evaluated.

Keywords

Acephateacetamipridbifenthrincyfluthrincypermethrindicrotophosdimethoateemanectin benzoateglyphosateimidaclopridindoxacarblambda-cyhalothrinmepiquat pentaboratemethoxyfenozidenitrogen fertilizer solution, (18.8% urea nitrogen and 6.2% water-soluble nitrogen)sodium calcium borate 10%spinosadthiamethoxamzeta-cypermethrinbarnyardgrass, Echinochloa crus-galli (L.) P. Beauv. # ECHCGhemp sesbania, Sesbania exaltata (Raf.) Rydb. ex A. W. Hill # SEBEXjohnsongrass, Sorghum halepense (L.) Pers. # SORHApitted morningglory, Ipomoea lacunosa L. # IPOLAsicklepod, Senna obtusifolia (L.) Irwin and Barneby # CASOBHerbicide–insecticide combinationspesticide compatibilityDAT, days after treatmentRCB, randomized complete block
Type
Research Article
Information
Weed Technology , Volume 19 , Issue 4 , December 2005 , pp. 1012 - 1016
Copyright
Copyright © Weed Science Society of America 

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