Abstract
Field studies were conducted at Morden, Manitoba from 1993 to 1995 to investigate the effect of cultivar selection on the effectiveness of metribuzin {4-amino-6-(1,1-dimethylethyl)-3-(methylthio)-1,2,4-triazin-5(4H)-one} for wild mustard control in field pea. In check plots, Titan, a cultivar with long vines, suppressed wild mustard growth more than Trump, a cultivar with short vines Wild mustard control with metribuzin was more consistent in Titan than in Trump. Metribuzin at 140 g ha−1 (half the full label rate) reduced wild mustard dry weight by 75 to 99% in plots seeded to Titan and by 38 to 88% in plots seeded to Trump. Results suggest that less herbicide is required for weed management in more competitive field pea cultivars. Key words: Cultivars, competitiveness, metribuzin, wild mustard, Sinapis arvensis, yield
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