AbstractThe dissipation of mecoprop in wheat (Triticum aestivumL.) and oat (Avena sativaL.) 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 f
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