Canada thistle control with aminopyralid in range, pasture, and noncrop areas

by Stephen F. Enloe, Rodney G. Lym, Robert Wilson, Phil Westra, Scott Nissen, George Beck, Michael Moechnig, Vanelle Peterson, Robert A. Masters, and Mary Halstvedt. 

Published in Weed Technology 2007 21:890-894.

ABSTRACT: Canada thistle is a serious weed of many crop, rangeland, pasture, and natural areas throughout North America. The objectives of this study were to compare aminopyralid efficacy, rates, and application timing with several commercial standards for Canada thistle control. Studies were conducted across the Great Plains at ten locations, which encompassed a wide range of environments. Results showed that aminopyralid provided effective Canada thistle control at lower use rates than current commercial standards and might be useful in areas where herbicides such as picloram and clopyralid are not recommended for use. Full abstract available here.

Published 2012; reviewed and updated June 2019