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Selective Application of Herbicides for Canada Thistle (Cirsium arvense) Control in Birdsfoot Trefoil (Lotus corniculatus)

Published online by Cambridge University Press:  12 June 2017

Chris M. Boerboom  and
Donald L. Wyse
Chris M. Boerboom
Affiliation:
Dep. Agron. Plant Genet., Univ. Minn., St. Paul, MN 55108
Donald L. Wyse
Affiliation:
Dep. Agron. Plant Genet., Univ. Minn., St. Paul, MN 55108
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Abstract

Canada thistle [Cirsium arvense [L.] Scop. # CIRAR] is a major weed problem in birdsfoot trefoil (Lotus corniculatus L. ‘Norcen’) seed production in northern Minnesota. Several systemic herbicides applied with selective applicators (roller and ropewick) were evaluated for Canada thistle control in birdsfoot trefoil. Picloram (4-amino-3,5,6-trichloro-2-pyridinecarboxylic acid), clopyralid (3,6-dichloro-2-pyridinecarboxylic acid), and glyphosate [N-(phosphonomethyl)glycine] controlled Canada thistle better than MCPA [(4-chloro-2-methylphenoxy)acetic acid] and dicamba (3,6-dichloro-2-methoxybenzoic acid). Glyphosate and MCPA did not injure birdsfoot trefoil foliage or bloom, whereas, picloram, clopyralid, and dicamba injured both. Although selective applications of glyphosate controlled Canada thistle for a short term with the least birdsfoot trefoil injury, long-term Canada thistle control in birdsfoot trefoil does not appear feasible with selective herbicide applications.

Keywords

Ropewick applicatorroller applicatorCIRAR
Type
Research
Information
Weed Technology , Volume 2 , Issue 2 , April 1988 , pp. 183 - 186
Copyright
Copyright © 1988 by the Weed Science Society of America 

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References

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