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Control of Selected Broadleaf Weeds with Glufosinate as Influenced by Insecticide Coapplication

Published online by Cambridge University Press:  20 January 2017

Donnie K. Miller ,
Robert G. Downer ,
E. Burris ,
B. Rogers Leonard  and
Bill J. Williams
Donnie K. Miller*
Affiliation:
Northeast Research Station, LSU AgCenter, P.O. Box 438, St. Joseph, LA 71366
Robert G. Downer
Affiliation:
Department of Experimental Statistics, LSU AgCenter, 161 Ag. Admin. Bldg., Baton Rouge, LA 70803
E. Burris
Affiliation:
Northeast Research Station, LSU AgCenter, P.O. Box 438, St. Joseph, LA 71366
Bill J. Williams
Affiliation:
Northeast Research Station, LSU AgCenter, P.O. Box 438, St. Joseph, LA 71366 Macon Ridge Location of the Northeast Research Station, LSU AgCenter, 212A Macon Ridge Rd., Winnsboro, LA 71295
*
Corresponding author's E-mail: dmiller@agctr.lsu.edu
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Abstract

Coapplication of herbicides and insecticides affords growers an opportunity to control multiple pests with one application, given that efficacy is not compromised. Glufosinate was applied at 470 g ai/ha both alone and in combination with the insecticides acephate, acetamiprid, bifenthrin, cyfluthrin, dicrotophos, emamectin benzoate, imidacloprid, indoxacarb, lambda-cyhalothrin, methoxyfenozide, spinosad, or thiamethoxam to determine coapplication effects on control of some of the more common and/or troublesome broadleaf weeds infesting cotton. Hemp sesbania, pitted morningglory, prickly sida, redroot pigweed, and sicklepod were treated at the three- to four- or the seven- to eight-leaf growth stage. When applied at the earlier application timing, glufosinate applied alone provided complete control at 14 d after treatment, and control was unaffected by coapplication with insecticides. When glufosinate application was delayed to the later application timing, visual weed control was unaffected by insecticide coapplication. Fresh-weight reduction from the herbicide applied to larger weeds was negatively impacted by addition of the insecticides dicrotophos and imidacloprid with respect to redroot pigweed and prickly sida, but only in one of two experiments. In most cases, delaying application of glufosinate to larger weeds resulted in reduced control compared to that from a three- to four-leaf application, with the extent of reduction varying by species. Results indicate that when applied according to the herbicide label (three- to four-leaf stage), glufosinate/ insecticide coapplications offer producers the ability to integrate pest management strategies and to limit application costs without sacrificing control of the broadleaf weeds evaluated.

Keywords

Acephate, O,S-dimethyl acetylphosphoramidothioatedicrotophos, 3-dimethoxyphosphinoyloxy-N,N-dimethylisocrotonamidepitted morningglory, Ipomoea lacunosa L. # IPOLAprickly sida, Sida spinosa L. # SIDSPredroot pigweed, Amaranthus retroflexus L. # AMAREsicklepod, Senna obtusifolia (L.) Irwin and barneby # CASOBHerbicide-insecticide combinationspesticide compatibilityDATdays after treatment
Type
Research Article
Information
Weed Technology , Volume 19 , Issue 3 , September 2005 , pp. 719 - 723
Copyright
Copyright © Weed Science Society of America 

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References

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