HERBICIDE COMPOSITION /ITS VERSIONS

Synergistic herbicidal activity is displayed by compositions comprising the following two components: (a) a pyrrolidone of the formula in which: X is selected from the group consisting of hydrogen, chlorine, and methyl; Y is selected from the group consisting of hydrogen, chlorine and bromine; Z is selected from the group consisting of chlorine and bromine; R is selected from the group consisting of hydrogen and C1-C4 alkyl; R is selected from the group consisting of hydrogen, halogen, C1-C4 alkyl, acetyl, trifluoromethyl, nitro, cyano, C1-C4 alkoxy, C1-C4 alkylthio, C1-C4 alkylsulfinyl, C1-C4 alkylsulfonyl, trifluoromethylsulfinyl, trifluoromethylsulfonyl, pentafluoropropionamido, and 3-methylureido; and R3 is selected from the group consisting of hydrogen, C1-C4 alkyl, chlorine and trifluoromethyl; and (b) a phosphonic acid of the formula in which: R is selected from the group consisting of C1-C4 alkyl, C1-C4 haloalkyl, and -CH2NHCH2COOH, at a weight ratio of (a) to (b) of from about 0.1:1 to about 20:1.