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Canada Thistle (Cirsium arvense) Control with Aminopyralid in Range, Pasture, and Noncrop Areas

Published online by Cambridge University Press:  20 January 2017

Stephen F. Enloe
Affiliation:
Department of Plant Sciences, 1000 E. University Avenue, University of Wyoming, Laramie, Wyoming 82071
Rodney G. Lym
Affiliation:
Department of Plant Sciences, North Dakota State University, Fargo, North Dakota 58105
Robert Wilson
Affiliation:
Department of Agronomy and Horticulture, University of Nebraska, Scottsbluff, NE 69361
Phil Westra
Affiliation:
Department of Bioagricultural Sciences and Pest Management, Colorado State University, Fort Collins, CO 80523
Scott Nissen
Affiliation:
Department of Bioagricultural Sciences and Pest Management, Colorado State University, Fort Collins, CO 80523
George Beck
Affiliation:
Department of Bioagricultural Sciences and Pest Management, Colorado State University, Fort Collins, CO 80523
Michael Moechnig
Affiliation:
Department of Plant Sciences, South Dakota State University, Brookings, SD, 57007
Vanelle Peterson
Affiliation:
Dow AgroSciences, 28884 S. Marshall Road, Mulino, OR 97042
Robert A. Masters
Affiliation:
Dow AgroSciences, 9330 Zionsville Road, Indianapolis, IN 46268
Mary Halstvedt
Affiliation:
Dow AgroSciences, 3311 Horton Smith Lane, Billings, MT 59106
Corresponding
E-mail address:

Abstract

Canada thistle is a serious weed of many crop, rangeland, pasture, and natural areas throughout North America. Aminopyralid is a new pyridine carboxylic acid herbicide that has activity on Canada thistle at lower use rates than current standard treatments. 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. Aminopyralid provided Canada thistle control comparable to picloram, picloram + 2,4-D amine, and clopyralid and better control than clopyralid + 2,4-D amine, dicamba, dicamba + 2,4-D amine and dicamba + diflufenzopyr. Canada thistle control was similar when aminopyralid was applied between 0.08 and 0.11 kg ai/ha and application timing (spring bolting vs. fall rosette/regrowth) did not strongly influence control 1 yr after treatment (YAT). 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.

Type
Research
Copyright
Copyright © Weed Science Society of America 

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