Metribuzin and trifluralin residues in faba bean following preplant incorporated application

Abstract

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