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Glyphosate–Insecticide Combination Effects on Weed and Insect Control in Cotton

Published online by Cambridge University Press:  20 January 2017

Joseph H. Pankey
Affiliation:
Department of Plant Pathology and Crop Physiology, LSU AgCenter, 302 Life Sciences Building, Baton Rouge, LA 70803
James L. Griffin
Affiliation:
Department of Agronomy, LSU AgCenter, 104 Sturgis Hall, Baton Rouge, LA 70803
B. Rogers Leonard
Affiliation:
Macon Ridge Location of the Northeast Research Station, LSU AgCenter, 212A Macon Ridge Road, Winnsboro, LA 71295
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. Administration Building, Baton Rouge, LA 70803
Richard W. Costello
Affiliation:
Department of Plant Pathology and Crop Physiology, LSU AgCenter, 302 Life Sciences Building, Baton Rouge, LA 70803
*
Corresponding author's E-mail: dmiller@agctr.lsu.edu

Abstract

Field studies were conducted to evaluate weed control with combinations of glyphosate at 750 g ae/ha and the insecticides acephate (370 g ai/ha), dicrotophos (370 g ai/ha), dimethoate (220 g ai/ha), fipronil (56 g ai/ha), imidacloprid (53 g ai/ha), lambda-cyhalothrin (37 g ai/ha), oxamyl (280 g ai/ha), or endosulfan (420 g ai/ha) and insect control with coapplication of the herbicide with insecticides acephate, dicrotophos, dimethoate, and imidacloprid. Applying lambda-cyhalothrin or fipronil with glyphosate reduced control of hemp sesbania by 19 and 9 percentage points, respectively, compared with glyphosate alone. Acephate, dicrotophos, dimethoate, imidacloprid, lambda-cyhalothrin, oxamyl, and endosulfan did not affect hemp sesbania, pitted morningglory, prickly sida, and redweed control by glyphosate. Lambda-cyhalothrin and fipronil did not affect glyphosate control of weeds other than hemp sesbania. Addition of glyphosate to dicrotophos improved cotton aphid control 4 d after treatment compared with dicrotophos alone. Thrips control was improved with addition of glyphosate to imidacloprid. Insect control was not reduced by glyphosate regardless of insecticide.

Type
Research
Copyright
Copyright © Weed Science Society of America 

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Footnotes

Current address: 25 S. Lake Dr., Monroe, LA 71203

References

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