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Tropical Spiderwort (Commelina benghalensis) Control in Glyphosate-Resistant Cotton

Published online by Cambridge University Press:  20 January 2017

A. Stanley Culpepper ,
J. T. Flanders ,
Alan C. York  and
Theodore M. Webster
A. Stanley Culpepper*
Affiliation:
Department of Crop and Soil Sciences, University of Georgia, P.O. Box 1209, Tifton, GA 31794
J. T. Flanders
Affiliation:
Department of Crop and Soil Sciences, University of Georgia, P.O. Box 1209, Tifton, GA 31794
Alan C. York
Affiliation:
Department of Crop Science, North Carolina State University, Box 7620, Raleigh, NC 27695
Theodore M. Webster
Affiliation:
Crop Protection and Management Research Unit, United States Department of Agriculture, Agricultural Research Service, Coastal Plain Experiment Station, Tifton, GA 31794
*
Corresponding author's E-mail: [email protected]
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Abstract

Tropical spiderwort has recently become the most troublesome weed in Georgia cotton. Most of Georgia's cotton is glyphosate resistant (GR), and glyphosate is only marginally effective on tropical spiderwort. An experiment was conducted at four locations to determine tropical spiderwort control in GR cotton by 27 herbicide systems. Treatments consisted of three early-postemergence over-the-top (POT) herbicide options and nine late–postemergence-directed (LPD) options arranged factorially. Glyphosate POT controlled tropical spiderwort only 53% 21 d after treatment (DAT). Glyphosate plus pyrithiobac or S-metolachlor controlled tropical spiderwort 60 and 80%, respectively. Pyrithiobac improved control of emerged spiderwort, whereas S-metolachlor provided residual control. Pooled over POT treatments, glyphosate LPD controlled tropical spiderwort 70% 21 DAT. Dimethipin mixed with glyphosate did not improve control. Carfentrazone, diuron, or flumioxazin mixed with glyphosate LPD improved control 9 to 15%. MSMA and MSMA plus flumioxazin were 8 and 19% more effective than glyphosate LPD. At time of cotton harvest, systems without residual herbicides at LPD controlled tropical spiderwort 42 to 45% compared with 64 to 76% with LPD treatments that included diuron or flumioxazin.

Keywords

CarfentrazonedimethipindiuronflumioxazinglyphosateMSMApyrithiobacS-metolachlortropical spiderwort, Commelina benghalensis L.cotton, Gossypium hirsutum L. ‘DP 458 B/RR’, ‘FM 989 B/RR’, ‘ST 4793 BR’Invasive weednoxious weedweed shiftDAP, days after plantingDAT, days after treatmentGR, glyphosate resistantLPD, late postemergence directedPOT, postemergence over-the-top
Type
Research
Information
Weed Technology , Volume 18 , Issue 2 , June 2004 , pp. 432 - 436
Copyright
Copyright © Weed Science Society of America 

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