Residues of mecoprop in post-emergence-treated wheat and oat
1992
Cessna, A.J.
The dissipation of mecoprop in wheat (Triticum aestivum L.) and oat (Avena sativa L.) was monitored over a growing season following post-emergence application of the dimethylamine salt of mecoprop to each crop at 1.1 kg ha-1. Residues of mecoprop, as its methyl ester, were determined gas chromatographically using electrolytic conductivity detection. Initial residues in wheat (119 +/- 20) mg kg-1) and oat (95.3 (+/- 10.0) mg kg-1) on the day of application (four-leaf stage of wheat and four- to five-leaf stage of oat) decreased to 0.1 to 0.2 mg kg-1, respectively, within six weeks. Residues were non-detectable in the mature seed of both crops. Recoveries of mecoprop were in the order of 90% from the green tissue and seed of both crops fortified at 0.05 mg kg-1.
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