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Purple Nutsedge (Cyperus rotundus) Control with Glyphosate in Soybean and Cotton

Published online by Cambridge University Press:  20 January 2017

Michael W. Edenfield ,
Barry J. Brecke ,
Daniel L. Colvin ,
Joan A. Dusky  and
Donn G. Shilling
Michael W. Edenfield*
Affiliation:
Agronomy Department, University of Florida, West Florida Research and Education Center, 5988 Hwy 90, Milton, FL 32583
Barry J. Brecke
Affiliation:
Agronomy Department, University of Florida, West Florida Research and Education Center, 5988 Hwy 90, Milton, FL 32583
Daniel L. Colvin
Affiliation:
Plant Science and Education Unit, University of Florida, 2556 West Hwy 318, Citra, FL 32113-2132
Joan A. Dusky
Affiliation:
University of Florida, 1038 McCarty Hall, Gainesville, FL 32611-0210
Donn G. Shilling
Affiliation:
Crop and Soil Science, University of Georgia, Athens GA 30602-7274
*
Corresponding author's E-mail: mike.edenfield@bayercropscience.com
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Abstract

Studies were conducted at the University of Florida, West Florida Research and Education Center to determine the effect of glyphosate on purple nutsedge control and nutsedge tuber production when glyphosate was applied to the same plots over 3 y in glyphosate-resistant soybean and cotton. Greater than 90% control of purple nutsedge foliage was achieved with a single POST application of glyphosate at 0.9 kg ai/ha in soybean or a sequential glyphosate application of 1.1 kg/ha POST followed by 0.6 kg/ha POST-directed in cotton. By the end of the third year of the study, these same treatments reduced purple nutsedge tuber density to less than 0.2% of the nontreated. In cotton, cultivation alone reduced tuber numbers by greater than 90%. Viability of tubers was also reduced by 80% in soybean and by 65% in cotton in the glyphosate-treated plots. Comparison treatments of imazaquin PRE followed by imazaquin POST in soybean or norflurazon PRE followed by cyanazine plus MSMA POST-directed in cotton also reduced purple nutsedge tuber density by ≥85% after three consecutive years of treatment.

Keywords

CyanazineglyphosatefluometuronimazaquinMSMAnorflurazonpendimethalinpurple nutsedge, Cyperus rotundus L., # CYPROcotton, Gossypium hirsutum L. ‘Delta Pine 5415 RR’soybean, Glycine max L. ‘Hartz 7555RR’CYPROtransgenic cottoncultivationpurple nutsedge population dynamicsDAP, days after plantingPOST-directed, postemergence directedEarly-POST, early postemergence
Type
Research Article
Information
Weed Technology , Volume 19 , Issue 4 , December 2005 , pp. 947 - 953
Copyright
Copyright © Weed Science Society of America 

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Footnotes

1 This research was supported by the Florida Agricultural Experiment Station and approved for publication as Journal Series R-09754.
Current address: Bayer CropScience, 17745 S. Metcalf, Bldg. #1, Stilwell, KS 66085-9104.

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