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Thiazopyr Stimulates Hairy Beggarticks (Bidens pilosa) Germination
Published online by Cambridge University Press: 12 June 2017
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.
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- Copyright © 1999 by the Weed Science Society of America
Footnotes
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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