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

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.

Type
Weed Control and Herbicide Technology
Copyright
Copyright © 1993 by the Weed Science Society of America 

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