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Residues of the Herbicides MCPA and Bromoxynil in Postemergence-Treated Triticale (× Triticosecale)

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

In a two-year study involving two sites in western Canada, the dissipation of bromoxynil octanoate alone at 0.35 or 0.42 kg phenol equivalent (pe)/ha and the tank mixture of MCPA iso-octyl ester at 0.28 kg ae/ha plus bromoxynil octanoate at 0.28 kg pe/ha was monitored in postemergence-treated triticale. Initial foliar residues on the day after application (three- to four-leaf stage of the crop) were of the order of 14 and 5 mg/kg for MCPA and bromoxynil, respectively. Residues of both herbicides decreased to less than the limit of quantification (0.025 mg/kg) of the analytical method 21 d after application. At crop maturity, herbicide residues were non-detectable in the straw and seed. There was little or no effect on the dissipation of bromoxynil residues due to tank mixing with MCPA.

Keywords

Bromoxynil, 3,5-dibromo-4-hydroxybenzonitrileMCPA, (4-chloro-2-methylphenoxy)acetic acidtriticale, X Triticosecale Wittmack ‘Welsh.’Gas chromatographymethylation
Type
Research
Information
Weed Technology , Volume 8 , Issue 3 , September 1994 , pp. 586 - 590
Copyright
Copyright © 1994 by the Weed Science Society of America 

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