Mixtures of from 50% to 83% by weight of: A. an acetanilide having the formula: CHEM wherein R1 and R2 are each selected from C1-C3 alkyl and alkoxy groups, R3 is selected from C1-C3 alkyl groups, and X and from 50% to 17% by weight of: is chloro or bromo; B. a triazole derivative having the formula: CHEM wherein each R is hydrogen or methyl and X is chloro or bromo, all percentages being based on the combined weights of A and B, are found to have surprising efficacy in suppressing seed head development in turf grasses.
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