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Influence of Cultivation Timing on Pyrithiobac Performance in Cotton (Gossypium hirsutum)1

Published online by Cambridge University Press:  20 January 2017

Eric P. Webster ,
David R. Shaw ,
Todd A. Baughman ,
Charles E. Snipes  and
Charles T. Bryson
Eric P. Webster
Affiliation:
Department of Plant and Soil Sciences, Mississippi State University, Mississippi State 39762
David R. Shaw*
Affiliation:
Department of Plant and Soil Sciences, Mississippi State University, Mississippi State 39762
Todd A. Baughman
Affiliation:
Department of Plant and Soil Sciences, Mississippi State University, Mississippi State 39762
Charles E. Snipes
Affiliation:
Delta Research and Extension Center, Stoneville, MS 38776
Charles T. Bryson
Affiliation:
USDA/ARS, Southern Weed Science Research Unit, Stoneville, MS 38776
*
Address correspondence to David R. Shaw, Mississippi State University, Box 9555, Mississippi State, MS 39762.
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Abstract

Pitted morningglory control with norflurazon or fluometuron preemergence (PRE), each at 1.12 kg/ha, was 72% or less 14 d after a postemergence (POST) application of pyrithiobac in 1993 and 1994. Pyrithiobac POST at 70 g/ha following fluometuron or norflurazon PRE cultivated at any timing controlled pitted morningglory at least 76%. Pyrithiobac POST controlled common cocklebur equal to the weed-free in 1993 at 14 d after the POST application. In 1994, when rated 28 d after pyrithiobac POST, cultivation 3 d before a single application of pyrithiobac controlled less common cocklebur than any other herbicide treatment containing pyrithiobac. At 28 d after pyrithiobac POST, no treatment controlled common cocklebur as well as the weed-free. In 1993 and 1994, seed cotton yield was equal to the weed-free when pyrithiobac followed fluometuron PRE cultivated at any timing or a single application of pyrithiobac cultivated prior to 7 d after POST application.

Keywords

Fluometuron, N,N′-dimethyl-N′-[3-(trifluoromethyl)phenyl]ureanorflurazon, 4-chloro-5-(methylamino)-2-(3-(trifluoromethyl)phenyl)-3(2H)-pyridazinonepyrithiobac, 2-chloro-6-[(4,6-dimethoxy-2-pyrimidinyl)thio] benzoic acid, sodium saltcommon cocklebur, Xanthium strumarium L. # XANSTpitted morningglory, Ipomoea lacunosa L. # IPOLAcotton, Gossypium hirsutum L. ‘DES-119’FluometuronnorflurazonIpomoea lacunosaXanthium strumariumIPOLAXANSTALS, acetolactate synthase (EC 4.1.3.18)DAPA, days after POST applicationDBPA, days before POST applicationDREC, Delta Research and Extension Centerfb, followed byIAPA, immediately after POST applicationPOST, postemergencePRE, preemergencePSRC, Plant Science Research CenterSWSRU, Southern Weed Science Research Unit Farm
Type
Research
Information
Weed Technology , Volume 14 , Issue 1 , March 2000 , pp. 116 - 121
Copyright
Copyright © Weed Science Society of America 

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Footnotes

1 Journal Article 9415 of the Mississippi Agricultural and Forestry Experiment Station, Mississippi State University.
Current address: Assistant Professor, 302 Life Sciences Building, Department of Plant Pathology and Crop Physiology, Louisiana State University Agricultural Center, Baton Rouge, LA 70803.
Current address: Extension Agronomist, Texas Agricultural Extension Service, Vernon, TX 76385.

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