Research was conducted at two sites near Brandon, Manitoba, in 1990 and 1991 to determine the influence of time of removal of wild mustard from triazine-tolerant (TT) or triazine-susceptible (TS) canola and the effects of wild mustard seed contamination on canola seed yield and oil characteristics. Wild mustard was removed by either cyanazine or ethametsulfuron at the two-to-four-leaf or the four-to-eight-leaf stage of wild mustard in each of six canola cultivars. Wild mustard decreased harvested seed yield of canola, and the presence of wild mustard seed in harvested canola seeds increased meal glucosinolate content compared with that of the weed-free check. Canola yield was greater than that of the untreated check when wild mustard was removed at either the two-to-four-leaf or the four-to-eight-leaf stage. Canola seed yield was reduced compared with that of the weed-free check when wild mustard was allowed to compete with canola until the four-to-eight-leaf stage. Meal protein content was decreased by either wild mustard competition or the presence of wild mustard seed in the samples in 1991 but not in 1990. Canola seed samples contaminated with wild mustard seed had reduced oil and oleic acid content at both sites. Wild mustard competition reduced canola oil and oleic acid content of the two TT cultivars more than it did those of TS cultivars. The presence of wild mustard seed (but not interference from wild mustard) increased the linolenic and erucic acid content of the extracted oil.
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McMullan et al. (1994) studied this question.