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1 September 2013 POST Control of Carolina Redroot (Lachnanthes caroliniana)
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Greenhouse studies were conducted in 2012 in Raleigh, NC to determine Carolina redroot control by ten POST herbicides. Paraquat and glufosinate provided the greatest control 14 (73 and 64%, respectively) and 25 d (82 and 68%, respectively) after treatment (DAT), but control declined between 25 and 63 DAT (72 and 59%, respectively). Glyphosate provided minimal control 14 DAT (18%), and control increased from 14 to 25 DAT (46%) and 25 to 63 DAT (69%). Control of Carolina redroot roots and rhizomes (roots/rhizomes) was greatest in plants treated with paraquat (91%), glyphosate (88%), glufosinate (73%), hexazinone (62%), diuron (60%). Nontreated Carolina redroot shoot and root/rhizome dry weight were 8.3 and 7.6 g, respectively. Paraquat, glufosinate, glyphosate, and diuron reduced both shoot and root/rhizome dry weight (3.1 and 0.7 g, 5.1 and 2.7 g, 5.4 and 1.0, 5.7 and 1.6 g, respectively). Hexazinone reduced root/rhizome dry weight (2.7 g). Fomesafen reduced shoot dry weight (6.1 g), but did not reduce root/rhizome dry weight. Paraquat, glufosinate, glyphosate, hexazinone, diuron, and clopyralid treatments resulted in reduced incidence of Carolina redroot flowering and anthesis.

Nomenclature: Clopyralid; diuron; flumioxazin; fomesafen; glufosinate; glyphosate; halosulfuron-methyl; hexazinone; paraquat; sethoxydim; Carolina redroot, Lachnanthes caroliniana (Lam.) Dandy.

En 2012, se realizaron estudios de invernadero en Raleigh, NC para determinar el control de Lachnanthes caroliniana con diez herbicidas POST. Paraquat y glufosinate brindaron el mayor control 14 d (73 y 64%, respectivamente) y 25 d (82 y 68%, respectivamente) después del tratamiento (DAT), pero el control disminuyó entre 25 y 63 DAT (72 y 59%, respectivamente). Glyphosate brindó un control mínimo 14 DAT (18%), y el control incrementó de 14 a 25 DAT (46%) y 25 a 63 DAT (69%). El control de las raíces y rizomas (raíces/rizomas) de L. caroliniana fue mayor en plantas tratadas con paraquat (91%), glyphosate (88%), glufosinate (73%), hexazinone (62%), diuron (60%). El peso seco del tejido aéreo y raíces/rizomas de L. caroliniana sin tratar fue 8.3 y 7.6 g, respectivamente. Paraquat, glufosinate, glyphosate, y diuron redujeron el peso seco del tejido aéreo y raíces/rizomas (3.1 y 0.7 g, 5.1 y 2.7, 5.4 y 1.0, 5.7 y 1.6 g, respectivamente). Hexazinone redujo el peso seco de raíces/rizomas (2.7 g). Fomesafen redujo el peso seco del tejido aéreo (6.1 g), pero no redujo el peso seco de raíces/rizomas. Los tratamientos con paraquat, glufosinate, glyphosate, hexazinone, diuron, y clopyralid resultaron en una incidencia reducida de floración y antesis de L. caroliniana.

Stephen L. Meyers, Katherine M. Jennings, David W. Monks, James R. Ballington, and David L. Jordan "POST Control of Carolina Redroot (Lachnanthes caroliniana)," Weed Technology 27(3), 534-537, (1 September 2013).
Received: 14 November 2012; Accepted: 1 February 2013; Published: 1 September 2013

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