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Thiazopyr Stimulates Hairy Beggarticks (Bidens pilosa) Germination

Published online by Cambridge University Press:  12 June 2017

Rakesh S. Chandran ,
Megh Singh  and
Sydha Salihu
Rakesh S. Chandran*
Affiliation:
Citrus Research and Education Center, University of Florida, Institute of Food and Agricultural Sciences, 700 Experiment Station Road, Lake Alfred, FL 33850-2299
Megh Singh
Affiliation:
Citrus Research and Education Center, University of Florida, Institute of Food and Agricultural Sciences, 700 Experiment Station Road, Lake Alfred, FL 33850-2299
Sydha Salihu
Affiliation:
Citrus Research and Education Center, University of Florida, Institute of Food and Agricultural Sciences, 700 Experiment Station Road, Lake Alfred, FL 33850-2299
*
Corresponding author's E-mail: rchandr2@wv.edu.
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Abstract

Observations in a citrus grove indicated that hairy beggarticks numbers were higher in plots receiving thiazopyr alone or thiazopyr with oxyfluorfen than in nontreated plots. At 120 days after treatment (DAT), approximately 90% more hairy beggarticks plants had emerged in plots receiving thiazopyr at 0.56 kg ai/ha than in nontreated plots. A tank mix of thiazopyr plus oxyfluorfen, each at 0.56 kg/ha, resulted in a 55% increase in hairy beggarticks number at 120 DAT. Greenhouse studies using seeds collected from sites with or without herbicide history produced similar results. Oxyfluorfen at 0.28 kg/ha stimulated seed germination but injured seedlings by 47% or more at 36 DAT when applied at higher rates. Thiazopyr applied at 0.56 kg/ha antagonized the preemergence activity of oxyfluorfen at 0.28 or 0.56 kg/ha. Thiazopyr at 1.12 kg/ha stimulated hairy beggarticks germination by 37% compared with nontreated containers.

Keywords

Oxyfluorfen, 2-chloro-1-(3-ethoxy-4-nitrophenoxy)-4-(trifluromethyl)benzenethiazopyr, methyl 2-(difluoromethyl)-5-(4,5-dihydro-2-thiazolyl)-4-(2-methylpropyl)-6-(trifluoromethyl)-3-pyridinecarboxylatehairy beggarticks, Bidens pilosa L. # BIDPIcitrus (Citrus sp.)GerminabilitystimulationscarificationantagonismSpanish needlesBidens albaBidens leucanthaDAT, days after treatmentPRE, preemergence; POST, postemergence
Type
Research
Information
Weed Technology , Volume 13 , Issue 3 , September 1999 , pp. 576 - 580
Copyright
Copyright © 1999 by the Weed Science Society of America 

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Footnotes

1

Publication R-06212 Florida Agricultural Experimental Station Journal Series.

Current address of corresponding author: Extension Specialist-IPM and Research Assistant Professor, 1076 Agricultural Sciences Building, West Virginia University, Morgantown, WV 26506-6108.

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