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Evaluation of Aminopyralid Applied PRE to Control Western Ragweed (Ambrosia psilostachya) in Oklahoma Pastureland

Published online by Cambridge University Press:  20 January 2017

Eddie R. Funderburg ,
James M. Locke  and
Jon T. Biermacher
Eddie R. Funderburg*
Affiliation:
Ag Research, Agricultural Division, Samuel Roberts Noble Foundation, 2510 Sam Noble Parkway, Ardmore, OK 73401
James M. Locke
Affiliation:
Ag Research, Agricultural Division, Samuel Roberts Noble Foundation, 2510 Sam Noble Parkway, Ardmore, OK 73401
Jon T. Biermacher
Affiliation:
Ag Research, Agricultural Division, Samuel Roberts Noble Foundation, 2510 Sam Noble Parkway, Ardmore, OK 73401
*
Corresponding author's E-mail: [email protected].
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Abstract

Western ragweed is problematic in Oklahoma pasture and rangeland. There are no labeled PRE herbicides for western ragweed control in pastures to allow ranchers the flexibility of extending the spray season or the ability to spray before emergence of sensitive crops in bordering fields. Field studies were conducted in four locations during a 2-yr period to determine the effects of applying aminopyralid PRE for control of western ragweed. Good to excellent control of western ragweed was obtained when aminopyralid rates of 89 g ae ha−1 or greater were applied PRE. Control was season long and equal to that obtained with a formulated mixture of 2,4-D and aminopyralid applied POST at a rate of 457 + 57 g ae ha−1. Sward height at time of PRE application had little to no effect on the efficacy of the treatment, but time after application before a significant rainfall event did influence the aminopyralid rate needed to achieve acceptable PRE control.

Ambrosia psilostachya es un problema en zonas de pastoreo en Oklahoma. No hay herbicidas PRE registrados para el control de A. psilostachya en pastos, de manera que le permita a los rancheros la flexibilidad de extender la temporada de aplicación o la habilidad de aplicar antes de la emergencia de cultivos sensibles en campos vecinos. Se realizaron estudios de campo en cuatro localidades durante un período de 2 años para determinar los efectos de la aplicación PRE de aminopyralid para el control de A. psilostachya. Se obtuvo un control de bueno a excelente de A. psilostachya cuando se aplicaron PRE dosis de 89 g ae ha−1 o mayores. El control duró toda la temporada y fue igual al obtenido con una formulación de una mezcla de 2,4-D y aminopyralid aplicada POST a una dosis de 457 + 57 g ae ha−1. La altura del pasto al momento de la aplicación PRE tuvo poco o ningún efecto en la eficacia del tratamiento, pero la duración del período después de la aplicación antes de un evento de lluvia importante influenció la dosis de aminopyralid requerida para alcanzar un control PRE aceptable.

Keywords

2,4-Daminopyralidwestern ragweed, Ambrosia psilostachya DC.Pasturerangelandsward heightweed control
Type
Research Article
Information
Weed Technology , Volume 28 , Issue 2 , June 2014 , pp. 395 - 400
Copyright
Copyright © Weed Science Society of America 

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