3-(Heterocyclyl)benzoylpyrazole derivatives of the formula I where: X is O, NH or N-alkyl; R1 is nitro, halogen, alkoxy, haloalkoxy, alkylthio, haloalkylthio, alkylsulfonyl or haloalkylsulfonyl; R2,R3,R4,R5 are hydrogen, alkyl or haloalkyl; R6 is halogen, nitro, haloalkyl, alkoxy, haloalkoxy, alkylthio, haloalkylthio, alkylsulfonyl or haloalkylsulfonyl; R7 is hydroxyl, alkoxy, alkenyloxy, alkylsulfonyloxy, alkylcarbonyloxy, (alkylthio)carbonyloxy, phenylsulfonyloxy or phenylcarbonyloxy, where the phenyl radical may be substituted; R8,R9 are alkyl; R10 is hydrogen or alkyl; R11 is hydrogen or alkyl; and their agriculturally useful salts, compounds for their preparation, and the use of these compounds or of compositions comprising them for controlling undesirable plants are described.