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1 October 2013 Poison Ivy (Toxicodendron radican) Control with Triclopyr and Metsulfuron, Applied Alone and in Tank Mixture
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Dermatitis from poison ivy is an important health problem, and considerable effort is devoted to the control of this virulent weed. Triclopyr, metsulfuron, and two fixed-ratio tank mixtures of triclopyr and metsulfuron were evaluated across a series of rates for poison ivy control. The objective was to test whether tank mixtures are more effective than triclopyr alone. Triclopyr, metsulfuron, and 9 : 1 and 8 : 2 (by weight) mixtures of these two herbicides, respectively, were applied at eight rates to 1-yr old, pot-grown poison ivy plants. Rates ranged in phytotoxicity from none to death. Percentage of control as determined from plant fresh weight reduction relative to a nontreated control was determined at 1 and 4 mo after treatment (MAT). Data were subjected to ANOVA followed by nonlinear regression. Rates required for 95% control at 1 MAT, control of regrowth at 4 MAT, and the costs of these treatments were determined for the herbicides applied alone and the mixtures. Triclopyr alone and metsulfuron alone were consistently the least and the most expensive treatments, respectively. The mixtures were intermediate to these extremes.

Nomenclature: Metsulfuron; triclopyr; poison ivy; Toxicodendron radican (L.) Kuntze.

La dermatitis causada por Toxicodendron radican es un problema de salud importante, por lo que se dedican esfuerzos considerables para el control de esta virulenta maleza. Se evaluó triclopyr, metsulfuron, y dos mezclas en tanque en proporciones fijas de triclopyr y metsulfuron a lo largo de una serie de dosis para el control de T. radican. El objetivo fue probar si mezclas en tanque son más efectivas que triclopyr solo. Triclopyr, metsulfuron, y mezclas 9:1 y 8:2 (por peso) de estos dos herbicidas, respectivamente, fueron aplicados a ocho dosis, a plantas de T. radican de un año de dad, crecidas en macetas. La fitotoxicidad causada por las dosis varió de ninguna a muerte. El porcentaje de control, determinado a partir de la reducción en el peso fresco en relación al testigo sin tratar, fue determinado a 1 y 4 meses después del tratamiento (MAT). Los datos se analizaron con ANOVA y con regresiones no-lineales. Las dosis requeridas para controlar 95% a 1 MAT, control de rebrote a 4 MAT, y el costo de estos tratamientos fue determinado para los herbicidas aplicados solos y en mezcla. Triclopyr y metsulfuron solos fueron consistentemente los tratamientos menos y más costoso, respectivamente. Las mezclas fueron intermedias en relación a estos extremos.

Glenn Wehtje, Charles H. Gilliam, and J. Scott McElroy "Poison Ivy (Toxicodendron radican) Control with Triclopyr and Metsulfuron, Applied Alone and in Tank Mixture," Weed Technology 27(4), 725-728, (1 October 2013).
Received: 22 February 2013; Accepted: 1 June 2013; Published: 1 October 2013

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