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Seasonal Variation in Macartney Rose (Rosa bracteata) Response to Herbicide Treatment

Published online by Cambridge University Press:  20 January 2017

Stephen F. Enloe  and
Dwight K. Lauer
Stephen F. Enloe*
Affiliation:
Department of Agronomy, University of Florida, Gainesville, FL 32653 Analyst, Silvics Analytic, Wingate, NC 28174
Dwight K. Lauer
Affiliation:
Department of Agronomy, University of Florida, Gainesville, FL 32653 Analyst, Silvics Analytic, Wingate, NC 28174
*
∗Corresponding author's E-mail: [email protected]
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Abstract

Macartney rose is an aggressive, thorny shrub that suppresses forage production and strongly hinders cattle grazing in southern pastures. Previous studies have found this weed to be extremely difficult to control with most pasture herbicides. We conducted two studies in central Alabama to assess several new herbicide chemistries applied at spring, early fall, and late fall timings. In the first study, we compared aminocyclopyrachlor, tank mixed with either 2,4-D, triclopyr, metsulfuron, or chlorsulfuron, with the commercial standard, picloram + 2,4-D. In the second study, we compared aminopyralid, tank mixed with either 2,4-D or metsulfuron and triclopyr + fluroxypyr, to the commercial standard, picloram + 2,4-D. Aminocyclopyrachlor + chlorsulfuron or metsulfuron and aminopyralid + 2,4-D or metsulfuron provided acceptable control and were comparable to picloram + 2,4-D at the early fall timing. Macartney rose control with treatments applied at the late fall timing tended to be less than commercially acceptable levels. We found that no herbicide treatment controlled Macartney rose at the spring timing. In addition, triclopyr + fluroxypyr did not control Macartney rose at any application timing. These results indicate that the early fall timing was optimal and that both aminocyclopyrachlor and aminopyralid can provide good Macartney rose control when mixed with certain other herbicides, including metsulfuron.

Rosa bracteata es un arbusto espinoso agresivo que suprime la producción de forrajes e inhibe fuertemente el pastoreo del ganado en pastizales del sur. Estudios previos han encontrado que esta maleza es extremadamente difícil de controlar con la mayoría de los herbicidas para pastos. Nosotros realizamos dos estudios en el centro de Alabama para evaluar varios herbicidas químicos nuevos, aplicados en la primavera, temprano en el otoño, y tarde en el otoño. En el primer estudio, comparamos con el estándar comercial, picloram + 2,4-D aplicaciones de aminocyclopyrachlor, mezclado ya fuese con 2,4-D, triclopyr, metsulfuron, o chlorsulfuron. En el segundo estudio, comparamos aminopyralid, mezclado en tanque con ya fuese 2,4-D o metsulfuron y triclopyr + fluroxypyr, con el estándar comercial, picloram + 2,4-D. Aminocyclopyrachlor + chlorsulfuron o metsulfuron y aminopyralid + 2,4-D o metsulfuron brindaron un control aceptable y fueron comparables con picloram + 2,4-D para aplicaciones temprano en el otoño. El control de R. bracteata con tratamientos aplicados tarde en el otoño tendió a ser inferior a los niveles comercialmente aceptables. Encontramos que ningún tratamiento con aplicaciones de herbicidas en la primavera controló R. bracteata. Adicionalmente, triclopyr + fluroxypyr no controló R. bracteata en ningún momento de aplicación. Estos resultados indican que temprano en el otoño fue el momento de aplicación óptimo y que tanto aminocyclopyrachlor como aminopyralid pueden brindar buen control de R. bracteata cuando se mezclan con otros herbicidas incluyendo metsulfuron.

Keywords

2,4-DaminocyclopyrachloraminopyralidchlorsulfuronfluroxypyrmetsulfuronpicloramtriclopyrMacartney rose, Rosa bracteata J.C. Wendl ROSBCHerbicide application timinginvasive rosemixed grass pasture
Type
Research Article
Information
Weed Technology , Volume 30 , Issue 3 , September 2016 , pp. 758 - 764
Copyright
Copyright © Weed Science Society of America 

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Footnotes

Associate editor for this paper: Bradley Hanson, University of California, Davis

References

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