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Chemical Control of Canada Thistle

Published online by Cambridge University Press:  12 June 2017

A. G. Carson  and
J. D. Bandeen
A. G. Carson
Affiliation:
Dep. of Crop Sci., Univ. of Guelph, Guelph, Ontario, Canada
J. D. Bandeen
Affiliation:
Dep. of Crop Sci., Univ. of Guelph, Guelph, Ontario, Canada
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Abstract

Field studies were conducted to evaluate the effectiveness of one, two, and three annual applications of atrazine [2-chloro-4-(ethylamino) −6-(isopropylamino)-s-triazine], 2,4-D [(2,4-dichlorophenoxy) acetic acid], dicamba (3,6-dichloro-o-anisic acid), and a three way mix of dicamba, mecoprop [2-[(4-chloro-o-tolyl) oxy]propionic acid], and 2,4-D at a ratio of 7:5:20 at different stages of development for the control of Canada thistle [Cirsium arvense (L.) Scop.]. Two consecutive annual applications in all atrazine treatments achieved the same level of control as cultivation every 5 weeks. In the year of the last treatment, Canada thistle was controlled with two or more consecutive annual applications of the hormone-type herbicides (2,4-D, dicamba, and the three way mix); however, in the year following the last treatment, regrowth occurred.

Type
Research Article
Information
Weed Science , Volume 23 , Issue 2 , March 1975 , pp. 116 - 118
Copyright
Copyright © 1975 by the Weed Science Society of America 

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References

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