Allan J. Cessna

Metribuzin residues in lentil following postemergence application

In a study involving two sites in western Canada, residues of the herbicide metribuzin in lentil were monitored by gas chromatography following postemergence application at 0.28 kg a.i. ha−1. On the day of spraying, initial residues in lentil green foliage were of the order of 1 mg kg−1. Metribuzin residues in the green foliage continually decreased with time to non-detectable levels (< 0.02 mg kg−1) at 42 d after application. No metribuzin residues were detected in the straw or mature seed. Key words: Metribuzin, 4-amino-6-(1,1-dimethylethyl)-3-(methylthio-1,2,4-triazin-5(4H)-one; lentil, Lens culinaris Medic., residues, residue analysis, gas chromatography

Metribuzin and trifluralin residues in faba bean following preplant incorporated application

In a study involving three sites in western Canada, residues of the herbicides metribuzin and trifluralin in faba bean (Vicia faba L.) were monitored by gas chromatography with electron-capture detection following pre-plant incorporation of tank mixtures of metribuzin plus trifluralin at (0.28 + 1.12) and (0.42 + 1.12) kg ha–1. In green foliage samples collected 40 to 48 and 90 d after seeding, mean residues (n = 4) of either herbicide did not exceed 0.10 mg kg–1. No metribuzin or trifluralin residues were detected in the mature seed. Key words: Metribuzin, trifluralin, faba bean, Vicia faba L., herbicide residues, gas chromatography