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Fluroxypyr Absorption and Translocation in Leafy Spurge (Euphorbia esula)

Published online by Cambridge University Press:  12 June 2017

Rodney G. Lym
Rodney G. Lym*
Affiliation:
Crop and Weed Sci. Dep., N.D. State Univ., Fargo, ND 58105
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Abstract

Absorption and translocation of 14C-fluroxypyr were determined for leafy spurge at various growth stages, under differing relative humidity and temperature conditions, and when applied with picloram or 2,4-D. Absorption of 14C-fluroxypyr was greater in vegetative plants (39%) than in flowering or postflowering plants (25%), while total translocated to roots averaged 2% of applied herbicide regardless of growth stage. Greater 14C-fluroxypyr absorption and translocation occurred in plants exposed to high relative humidity (>90%) compared to low humidity (<30%) for 6 h or longer following treatment. Absorption and translocation to roots was independent of temperature (18 or 24 C). Absorption and translocation declined by 50% when applied with picloram or 2,4-D. However, absorption and translocation of 14C-picloram or 14C-2,4-D were not affected by fluroxypyr. Fluroxypyr would likely be used in a leafy spurge control program only during environmental conditions adverse to control with picloram such as unseasonably warm or cold temperatures or in areas with a high water table.

Keywords

Fluroxypyr, 4-amino-3,5-dichloro-6-fluoro-2-pyridyloxyacetic acidpicloram, 4-amino-3,5,6-trichloro-2-pyridinecarboxylic acid2,4-D, (2,4-dichlorophenoxy)acetic acidleafy spurge, Euphorbia esula L # EPHESpicloram, 2,4-Dherbicide combinationperennial weedtemperaturerelative humidityEPHES
Type
Weed Control and Herbicide Technology
Information
Weed Science , Volume 40 , Issue 1 , March 1992 , pp. 101 - 105
Copyright
Copyright © 1992 by the Weed Science Society of America 

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References

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