The present invention is directed to the use of at least one 3 -isoxazolidone herbicide selected from the group consisting of 2-(2,4-dichlorophenyl)methyl-4,4-dimethyl-3 -isoxazolidone and 2-(2,5-dichlorophenyl)methyl-4,4-dimethyl-3-isoxazolidone as a selective herbicide in a grass or brassica crop selected from the group consisting of corn, rice, sorghum, barley, rye, and canola.