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Pyrithiobac and Insecticide Coapplication Effects on Cotton Tolerance and Broadleaf Weed and Thrips (Frankliniella spp.) Control

Published online by Cambridge University Press:  20 January 2017

Richard W. Costello ,
James L. Griffin ,
B. Rogers Leonard ,
Donnie K. Miller  and
Gabie E. Church
Richard W. Costello
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
Gabie E. Church
Affiliation:
Department of Experimental Statistics, LSU AgCenter, 161 Ag. Admin. Building, Baton Rouge, LA 70803
*
Corresponding author's E-mail: [email protected]
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Abstract

Field studies investigated possible interactions associated with early-season coapplication of the herbicide pyrithiobac and various insecticides. Pyrithiobac at 70 g ai/ha, in combination with the insecticides acephate or dicrotophos at 370 g ai/ha, fipronil at 56 g ai/ha, imidacloprid at 52 g ai/ha, lambda-cyhalothrin at 37 g ai/ha, or oxamyl, carbofuran, or dimethoate at 280 g ai/ha did not reduce cotton leaf area, height, main stem node number, main stem nodes to first square, days to first square or flower, main stem nodes above white flower, or seed cotton yield compared with pyrithiobac alone. Pyrithiobac alone reduced dry weight of pitted morningglory, hemp sesbania, prickly sida, velvetleaf, and entireleaf–ivyleaf morningglory 28 d after treatment (DAT) 86, 98, 51, 94, and 91%, respectively, and weed control was not affected by the coapplication of insecticides. Control of thrips (adult plus larvae) 5 DAT with insecticides was unaffected by pyrithiobac addition at the P = 0.05 level of significance. At the P = 0.1 level, however, addition of pyrithiobac to dimethoate resulted in a reduction in insecticide efficacy in one of three experiments. Efficacy of other insecticides was unaffected.

Keywords

Acephate, O,S-dimethyl acetylphosphoramidothioatecarbofuran, 2,3-dihydro-2,2-dimethylbenzofuran-7-yl methylcarbamatedicrotophos, 3-dimethoxyphosphinoyloxy-N,N-dimethylisocrotonamidepyrithiobacpitted morningglory, Ipomoea lacunosa L. # IPOLAprickly sida, Sida spinosa L. # SIDSPvelvetleaf, Abutilon theophrasti Medic. # ABUTHcotton, Gossypium hirsutum L.Herbicide–insecticide interactionDAT, days after treatmentNAWF, node above white flowerPOST, postemergencePPI, preplant incorporatedPRE, preemergence
Type
Research Article
Information
Weed Technology , Volume 19 , Issue 2 , June 2005 , pp. 430 - 436
Copyright
Copyright © Weed Science Society of America 

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Footnotes

Current address: 2907 Highway 586, Oak Grove, LA 71263.

References

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