A composition comprising A) a benzoxazinone of the formula I wherein R 1 is hydrogen or halogen; R 2 is halogen; R 3 is hydrogen or halogen; R 4 is hydrogen, C 1 -C 6 -alkyl, C 1 -C 6 -haloalkyl, C 3 -C 6 -cycloalkyl, C 3 -C 6 -alkenyl, C 3 -C 6 -haloalkenyl, C 3 -C 6 -alkynyl, C 3 -C 6 -haloalkynyl, C 1 -C 6 -alkoxy or C 3 -C 6 -cycloalkyl-C 1 -C 6 -alkyl; R 5 is hydrogen, NH 2, C 1 -C 6 -alkyl or C 3 -C 6 -alkynyl; R 6 is hydrogen or C 1 -C 6 -alkyl; and W is O or S; Z is O or S; and B) a safener of formula II wherein n is 1 to 5; R 7 is hydrogen, halogen, CN, NO 2, C 1 -C 6 -alkyl, C 1 -C 6 -haloalkyl, OH, C 1 -C 6 -alkoxy, C 1 -C 6 -haloalkoxy, NH 2, carboxyl, carbamoyl, formyl or sulfamoyl; R 8 is hydrogen or C 1 -C 6 -alkyl; R 9 is hydrogen, halogen, CN, NO 2, C 1 -C 6 -alkyl, C 1 -C 6 -haloalkyl, OH, C 1 -C 6 -alkoxy, C 1 -C 6 -haloalkoxy, NH 2, carboxyl, carbamoyl, formyl or sulfamoyl; R 10 is hydrogen or C 1 -C 6 -alkyl; and R 11 is hydrogen, C 1 -C 6 -alkyl, C 1 -C 6 -haloalkyl, C 1 -C 6 -alkoxy-C 1 -C 6 -alkyl, C 1 -C 6 -alkoxy, C 1 -C 6 -alkylthio, C 1 -C 6 -alkylamino, di(C 1 -C 6 -alkyl)amino, C 3 -C 6 -cycloalkylamino or C 3 -C 6 -cycloalkyl. A) a benzoxazinone of the formula I wherein R 1 is hydrogen or halogen; R 2 is halogen; R 3 is hydrogen or halogen; R 4 is hydrogen, C 1 -C 6 -alkyl, C 1 -C 6 -haloalkyl, C 3 -C 6 -cycloalkyl, C 3 -C 6 -alkenyl, C 3 -C 6 -haloalkenyl, C 3 -C 6 -alkynyl, C 3 -C 6 -haloalkynyl, C 1 -C 6 -alkoxy or C 3 -C 6 -cycloalkyl-C 1 -C 6 -alkyl; R 5 is hydrogen, NH 2, C 1 -C 6 -alkyl or C 3 -C 6 -alkynyl; R 6 is hydrogen or C 1 -C 6 -alkyl; and W is O or S; Z is O or S; and R 1 is hydrogen or halogen; R 2 is halogen; R 3 is hydrogen or halogen; R 4 is hydrogen, C 1 -C 6 -alkyl, C 1 -C 6 -haloalkyl, C 3 -C 6 -cycloalkyl, C 3 -C 6 -alkenyl, C 3 -C 6 -haloalkenyl, C 3 -C 6 -alkynyl, C 3 -C 6 -haloalkynyl, C 1 -C 6 -alkoxy or C 3 -C 6 -cycloalkyl-C 1 -C 6 -alkyl; R 5 is hydrogen, NH 2, C 1 -C 6 -alkyl or C 3 -C 6 -alkynyl; R 6 is hydrogen or C 1 -C 6 -alkyl; and W is O or S; Z is O or S; and B) a safener of formula II wherein n is 1 to 5; R 7 is hydrogen, halogen, CN, NO 2, C 1 -C 6 -alkyl, C 1 -C 6 -haloalkyl, OH, C 1 -C 6 -alkoxy, C 1 -C 6 -haloalkoxy, NH 2, carboxyl, carbamoyl, formyl or sulfamoyl; R 8 is hydrogen or C 1 -C 6 -alkyl; R 9 is hydrogen, halogen, CN, NO 2, C 1 -C 6 -alkyl, C 1 -C 6 -haloalkyl, OH, C 1 -C 6 -alkoxy, C 1 -C 6 -haloalkoxy, NH 2, carboxyl, carbamoyl, formyl or sulfamoyl; R 10 is hydrogen or C 1 -C 6 -alkyl; and R 11 is hydrogen, C 1 -C 6 -alkyl, C 1 -C 6 -haloalkyl, C 1 -C 6 -alkoxy-C 1 -C 6 -alkyl, C 1 -C 6 -alkoxy, C 1 -C 6 -alkylthio, C 1 -C 6 -alkylamino, di(C 1 -C 6 -alkyl)amino, C 3 -C 6 -cycloalkylamino or C 3 -C 6 -cycloalkyl. n is 1 to 5; R 7 is hydrogen, halogen, CN, NO 2, C 1 -C 6 -alkyl, C 1 -C 6 -haloalkyl, OH, C 1 -C 6 -alkoxy, C 1 -C 6 -haloalkoxy, NH 2, carboxyl, carbamoyl, formyl or sulfamoyl; R 8 is hydrogen or C 1 -C 6 -alkyl; R 9 is hydrogen, halogen, CN, NO 2, C 1 -C 6 -alkyl, C 1 -C 6 -haloalkyl, OH, C 1 -C 6 -alkoxy, C 1 -C 6 -haloalkoxy, NH 2, carboxyl, carbamoyl, formyl or sulfamoyl; R 10 is hydrogen or C 1 -C 6 -alkyl; and R 11 is hydrogen, C 1 -C 6 -alkyl, C 1 -C 6 -haloalkyl, C 1 -C 6 -alkoxy-C 1 -C 6 -alkyl, C 1 -C 6 -alkoxy, C 1 -C 6 -alkylthio, C 1 -C 6 -alkylamino, di(C 1 -C 6 -alkyl)amino, C 3 -C 6 -cycloalkylamino or C 3 -C 6 -cycloalkyl.