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Relative Foliar Uptake of a Tank Mixture of 2,4-D and Dicamba by Wheat

Published online by Cambridge University Press:  12 June 2017

Allan J. Cessna
Allan J. Cessna*
Affiliation:
Agric. Canada Res. Stn., Regina, SK, Canada S4P 3A2
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Abstract

Leaf washing was used to determine relative rates of uptake of 2,4-D and dicamba dimethylamine salts by wheat following field application of a postemergence tank mixture (3:1) of 476 g ae ha-1 at the 4- to 5-leaf growth stage. Foliar herbicide deposits and total acid residues in the crop were determined the day of spraying as well as 2 and 7 d after spraying. Leaf washing of foliage samples collected on the day of spraying indicated that the crop/weed canopy intercepted 51% of the application, and that dicamba was taken up more quickly than 2,4-D. Within a few hours of spraying, approximately 80% of the deposited dicamba and 65% of 2,4-D were taken up by the crop. A 35-mm rain during the first 48 h after application reduced plant surface deposits of both herbicides by more than 98%. During this 2-d period, dicamba residues within the crop were metabolized more quickly than those of 2,4-D. There was little difference in effectiveness among water, 10% methanol, 25% methanol, or 90% methanol in removing plant surface deposits of 2,4-D and dicamba from wheat.

Keywords

2,4-D (2,4-dichlorophenoxy)acetic aciddicamba, 3,6-dichloro-2-methoxybenzoic acidwheat, Triticum aestivum L. ‘Neepawa’Rainfall washoffherbicide uptakeherbicide dissipation
Type
Special Topics
Information
Weed Science , Volume 41 , Issue 4 , December 1993 , pp. 682 - 686
Copyright
Copyright © 1994 by the Weed Science Society of America 

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References

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