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Absorption, Translocation, and Foliar Activity of Clopyralid and Chlorsulfuron in Canada Thistle (Cirsium arvense) and Perennial Sowthistle (Sonchus arvensis)

Published online by Cambridge University Press:  12 June 2017

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

Both 14C-clopyralid (3,6-dichloropicolinic acid) and 14C-chlorsulfuron {2-chloro-N-[[(4-methoxy-6-methyl-1,3,5-triazin-2-yl)amino]carbonyl]benzensulfonamide} were readily absorbed by Canada thistle [Cirsium arvense (L.) Scop. ♯ CIRAR] leaves, with 99 and 75%, respectively, of the applied doses absorbed 144 h after application. Absorbed 14C-clopyralid was rapidly exported from the treated leaves, whereas 14C-chlorsulfuron was translocated much more slowly. After 144 h, 29% of the applied 14C-clopyralid and 5% of the applied 14C-chlorsulfuron were recovered in the roots and developing root buds of Canada thistle plants. Smaller amounts of the two herbicides were absorbed and translocated in perennial sowthistle (Sonchus arvensis L. ♯ SONAR) than in Canada thistle. More 14C-clopyralid than 14C-chlorsulfuron was absorbed and translocated out of treated leaves of perennial sowthistle, but equal amounts, 3 to 4% of the applied doses, were recovered in the roots and root buds 144 h after application. Foliar applications of clopyralid, followed by removal of the treated shoot 24, 72, or 144 h after application, markedly reduced shoot regrowth in both Canada thistle and perennial sowthistle. Similar treatment with chlorsulfuron did not prevent shoot regrowth in either species.

Keywords

CIRARSONAR
Type
Weed Control and Herbicide Technology
Information
Weed Science , Volume 33 , Issue 4 , July 1985 , pp. 524 - 530
Copyright
Copyright © 1985 by the Weed Science Society of America 

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