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Retreatment with Fall-Applied Herbicides for Canada Thistle (Cirsium arvense) Control

Published online by Cambridge University Press:  12 June 2017

William W. Donald
William W. Donald*
Affiliation:
Agric. Res. Serv., U. S. Dep. Agric., Bioscience Res. Lab., Fargo, ND 58105
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Abstract

This field research was designed to compare the long-term effectiveness of late-September applications of several herbicides for reducing Canada thistle shoot density on noncropped, untilled abandoned farmland when reapplied annually for 3 yr. Clopyralid at 560 and 840 g ae ha−1 or picloram at 280 and 560 g ae ha−1 reduced Canada thistle shoot density as well as either glyphosate3 at 0.8 to 2.8 kg ae ha−1 or dicamba at 1.1 and 2.2 kg ae ha−1. These treatments were much more effective than 2,4-D at 1.1 and 2.2 kg ae ha−1, chlorsulfuron at 34 and 67 g ai ha−1, and metsulfuron at 34 and 67 g ha−1 for progressively reducing Canada thistle shoot density over three annual fall applications. Picloram and clopyralid greatly reduced and delayed shoot emergence from adventitious root buds in spring after two fall-applied treatments compared with nontreated checks.

Keywords

Chlorsulfuron, 2-chloro-N-[[(4-methoxy-6-methyl-1,3,5,-triazin-2-yl)amino]carbonyl]benzenesulfonamideclopyralid, 3,6-dichloro-2-pyridinecarboxylic aciddicamba, 3,6-dichloro-2-methoxybenzoic acidglyphosate, N-(phosphonomethyl)glycinemetsulfuron, 2-[[[[(4-methoxy-6-methyl-1,3,5-triazin-2-yl)amino]carbonyl]amino]sulfonyl]benzoic acidpicloram, 4-amino-3,5,6-trichloro-2-pyridinecarboxylic acid2,4-D, (2,4-dichlorophenoxy)acetic acidCanada thistle, Cirsium arvense (L.) Scop. #4 CIRARPerennial weedchlorsulfuronclopyraliddicambaglyphosatemetsulfuronpicloram2,4-DCIRAR
Type
Weed Control and Herbicide Technology
Information
Weed Science , Volume 41 , Issue 3 , September 1993 , pp. 434 - 440
Copyright
Copyright © 1993 by the Weed Science Society of America 

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References

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