CONTROL OF WILD MUSTARD IN CANOLA WITH POSTEMERGENCE HERBICIDES

Publisher Website
Google Scholar
Abstract
Field studies were conducted in 1986 and 1987 to determine the effectiveness of DPX-A7881 [methyl 2-[(4-ethoxy-6-methylamino-1,3,5-triazin-2-yl) = carbamoyl-sulphanoyl]benzoate] and imazamethabenz for the selective removal of wild mustard Sinapis arvensis L. (Brassica kaber [DC] Wheeler var. pinnatifida [Stokes] Wheeler) from canola (Brassica napus L.). Both DPX-A7881 and imazamethabenz controlled wild mustard when applied at the proper dosage and stage of growth. Susceptibility of wild mustard to either herbicide declined when the herbicide treatment was delayed beyond the six-leaf stage. DPX-A7881 applied postemergence at 10–15 g a.i. ha−1 to wild mustard seedlings in the cotyledon leaf stage of development did not reduce crop yields and significantly reduced the level of 4-hydroxy-benzyl glucosinolate from wild mustard found in canola meal. Canola cultivar Global exhibited greater tolerance to post-emergence applications of DPX-A7881 than to imazamethabenz. The total concentration of canola glucosinolates was found to increase in seed samples taken from plants injured by postemergence applications of imazamethabenz.Key words: Canola, herbicides, wild mustard, seed yield, glucosinolates