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Contribution of Soil Spray Deposit from Postemergence Herbicide Applications to Control of Canada Thistle (Cirsium arvense)

Published online by Cambridge University Press:  12 June 2017

J. Christopher Hall ,
Hank D. Bestman ,
Malcolm D. Devine  and
William H. Vanden Born
J. Christopher Hall
Affiliation:
Dep. Plant Sci., Univ. Alberta, Edmonton, AB., Canada T6G 2P5
Hank D. Bestman
Affiliation:
Dep. Plant Sci., Univ. Alberta, Edmonton, AB., Canada T6G 2P5
Malcolm D. Devine
Affiliation:
Dep. Plant Sci., Univ. Alberta, Edmonton, AB., Canada T6G 2P5
William H. Vanden Born
Affiliation:
Dep. Plant Sci., Univ. Alberta, Edmonton, AB., Canada T6G 2P5
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Abstract

Foliage-only, soil-only, and foliage plus soil applications of picloram (4-amino-3,5,6-trichloro-2-pyridinecarboxylic acid), clopyralid (3,6-dichloro-2-pyridinecarboxylic acid), chlorsulfuron {2-chloro-N-[[(4-methoxy-6-methyl-1,3,5-triazin-2-yl)amino]carbonyl]benzenesulfonamide}, and metsulfuron {2-[[[[(4-methoxy-6-methyl-1,3,5-triazin-2-yl)amino]carbonyl]amino]sulfonyl]benzoic acid} were used to determine the contribution of soil spray deposit to the control of Canada thistle [Cirsium arvense (L.) Scop. ♯ CIRAR] under greenhouse conditions. Herbicide reaching the soil contributed significantly to the suppression of secondary shoot growth, particularly when pots were watered from above. In subirrigated pots, the herbicides showed activity if they were sprayed on moist soil, but not if they were sprayed on dry soil. These results suggest that it is important to shield the soil during postemergence applications of herbicides in greenhouse experiments in order to avoid overestimating foliar activity.

Keywords

PicloramclopyralidchlorsulfuronmetsulfuronCIRAR
Type
Weed Control and Herbicide Technology
Information
Weed Science , Volume 33 , Issue 6 , November 1985 , pp. 836 - 839
Copyright
Copyright © 1985 by the Weed Science Society of America 

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References

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