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Canada Thistle Control on Roadsides

Published online by Cambridge University Press:  12 June 2017

L. E. Foote ,
D. L. Kill  and
C. S. Williams
L. E. Foote
Affiliation:
Minnesota State Highway Department
D. L. Kill
Affiliation:
U.O.P., Johnson Div.
C. S. Williams
Affiliation:
The Dow Chemical Company, Plant Science Research and Development, Midland, Michigan
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Abstract

Canada thistle (Cirsium arvense (L.) Scop.) on roadsides was controlled by 4-amino-3,5,6-trichloropicolinic acid (picloram), (2,4-dichlorophenoxy)acetic acid (2,4-D), and (2,4,5-trichlorophenoxy)acetic acid (2,4,5-T), alone and in combination at various rates. There was no synergistic or additive effect, as determined by Canada thistle response, due to the addition of 2,4-D or 2,4,5-T to picloram. Control with ¾ lb/A picloram was not significantly less than that obtained with higher rates 1½ and 2 lb/A. Picloram reduced Canada thistle stands 80 to 100% and 2,4-D generally reduced the plant population 50% or less during the year of application and the year after. Late summer appeared to be an opportune time for spraying Canada thistle with ¾ to 1 lb/A picloram.

Type
Research Article
Information
Weed Science , Volume 18 , Issue 2 , March 1970 , pp. 307 - 310
Copyright
Copyright © 1970 Weed Science Society of America 

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References

Literature Cited

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