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Absorption, Translocation, and Metabolism of Picloram and 2,4-D in Leafy Spurge (Euphorbia esula)

Published online by Cambridge University Press:  12 June 2017

Rodney G. Lym  and
Kevin D. Moxness
Rodney G. Lym
Affiliation:
Crop Weed Sci. Dep., North Dakota State Univ., Fargo, ND 58105
Kevin D. Moxness
Affiliation:
Crop Weed Sci. Dep., North Dakota State Univ., Fargo, ND 58105
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Abstract

The absorption, translocation, and metabolism of 14C-picloram and 14C-2,4-D applied alone and together to leafy spurge was evaluated. Leafy spurge absorbed 34 and 24% of the 14C-2,4-D applied alone and with picloram, respectively, and 14 and 10% of the 14C-picloram applied alone and with 2,4-D, respectively. More 14C-2,4-D was translocated in leafy spurge than 14C-picloram, and adding picloram to 14C-2,4-D decreased 14C translocation to the roots. Adding 2,4-D to 14C-picloram increased the percentage of absorbed 14C that translocated in leafy spurge from 28 to 48%. Generally, 14C-picloram and 14C-2,4-D remained as the parent acid in leafy spurge whether applied alone or together. Of 14C-picloram recovered from the roots, 83% was unmetabolized picloram when applied alone compared to 95% when applied with 2,4-D, which probably is the reason for increased leafy spurge control when these herbicides are applied together.

Keywords

Picloram, 4-amino-3,5,6-trichloro-2-pyridinecarboxylic acid2,4-D, (2,4-dichlorophenoxy)acetic acidleafy spurge, Euphorbia esula L. ♯3 EPHESRangeland weed controlherbicide synergism
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 37 , Issue 4 , July 1989 , pp. 498 - 502
Copyright
Copyright © 1989 by the Weed Science Society of America 

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