Benzoxazinones of formula I wherein R 1 is hydrogen or halogen; R 2 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 3 is halogen; R 4 is halogen; X is O or S; and Y is a substituent selected from the group consisting of Y 2, Y 12, Y 13, Y 20, Y 31, Y 37, Y 38, Y 39, Y 42 and Y 55: wherein A 1, A 4 to A 7 are oxygen or sulfur; A 11 is oxygen, sulphur, SO or SO 2; A 12 and A 15 are oxygen or sulfur; R 37, R 38, R 39, R 43 and R 44 are hydrogen, hydroxy, C 1 -C 6 -alkyl, C 1 -C 6 -haloalkyl, C 3 -C 7 -cycloalkyl, C 3 -C 7 -cycloalkyloxy, C 1 -C 6 -alkoxy, C 1 -C 6 -haloalkoxy, C 2 -C 6 -alkenyl, C 2 -C 6 -haloalkenyl, C 2 -C 6 -alkenyloxy, C 3 -C 6 -alkynyl, C 3 -C 6 -alkynyloxy, C 1 -C 6 -alkylthio, C 1 -C 6 -alkylsulfinyl, C 1 -C 6 -alkylsulfonyl, C 1 -C 6 -alkoxysulfonyl, C 1 -C 6 -alkylsulfonyloxy, amino, C 1 -C 6 -alkylamino or di(C 1 -C 6 -alkyl)amino; R 9, R 10, R 11, R 12, R 20, R 21, R 25, R 26, R 33 and R 34 are hydrogen, cyano, hydroxy, C 1 -C 6 -alkyl, C 1 -C 6 -cyanoalkyl, C 1 -C 6 -haloalkyl, C 3 -C 7 -cycloalkyl, C 3 -C 7 -cycloalkyloxy, C 1 -C 6 -alkoxy, C 1 -C 6 -haloalkoxy, C 2 -C 6 -alkenyl, C 2 -C 6 -haloalkenyl, C 2 -C 6 -alkenyloxy, C 3 -C 6 -alkynyl, C 3 -C 6 -alkynyloxy, C 1 -C 6 -alkylsulfinyl, C 1 -C 6 -alkylsulfonyl, phenyl-C 1 -C 6 -alkyl, amino, C 1 -C 6 -alkylamino or di(C 1 -C 6 -alkyl)amino; or R 11 and R 12, R 25 and R 26, or R 33 and R 34, together with the atoms to which they are attached, form a three- to six-membered cycle, which is saturated, partial unsaturated or aromatic, which may comprise apart from carbon atoms one to four nitrogen atoms, or one or two oxygen atoms, or one or two sulfur atoms, or one to three nitrogen atoms and an oxygen atom, or one to three nitrogen atoms and a sulfur atom, or one sulfur and one oxygen atom, and which for its part may be partially or fully halogenated and/or substituted by one to three radicals from the group consisting of C 1 -C 6 -alkyl and C 1 -C 6 -alkoxy; R 14 and R 15 are hydrogen, halogen or C 1 -C 6 -alkyl; R 19, R 35, R 36 and R 42 are hydrogen, halogen, hydroxy, C 1 -C 6 -alkyl, C 1 -C 6 -haloalkyl, C 3 -C 7 -cycloalkyl, C 3 -C 7 -cycloalkyloxy, C 1 -C 6 -alkoxy, C 1 -C 6 -haloalkoxy, C 1 -C 6 -alkylthio, C 1 -C 6 -haloalkylthio, C 2 -C 6 -alkenyl, C 2 -C 6 -haloalkenyl, C 2 -C 6 -alkenyloxy, C 3 -C 6 -alkynyl or C 3 -C 6 -alkynyloxy; and including their agriculturally acceptable salts. R 1 is hydrogen or halogen; R 2 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 3 is halogen; R 4 is halogen; X is O or S; and Y is a substituent selected from the group consisting of Y 2, Y 12, Y 13, Y 20, Y 31, Y 37, Y 38, Y 39, Y 42 and Y 55: A 1, A 4 to A 7 are oxygen or sulfur; A 11 is oxygen, sulphur, SO or SO 2; A 12 and A 15 are oxygen or sulfur; R 37, R 38, R 39, R 43 and R 44 are hydrogen, hydroxy, C 1 -C 6 -alkyl, C 1 -C 6 -haloalkyl, C 3 -C 7 -cycloalkyl, C 3 -C 7 -cycloalkyloxy, C 1 -C 6 -alkoxy, C 1 -C 6 -haloalkoxy, C 2 -C 6 -alkenyl, C 2 -C 6 -haloalkenyl, C 2 -C 6 -alkenyloxy, C 3 -C 6 -alkynyl, C 3 -C 6 -alkynyloxy, C 1 -C 6 -alkylthio, C 1 -C 6 -alkylsulfinyl, C 1 -C 6 -alkylsulfonyl, C 1 -C 6 -alkoxysulfonyl, C 1 -C 6 -alkylsulfonyloxy, amino, C 1 -C 6 -alkylamino or di(C 1 -C 6 -alkyl)amino; R 9, R 10, R 11, R 12, R 20, R 21, R 25, R 26, R 33 and R 34 are hydrogen, cyano, hydroxy, C 1 -C 6 -alkyl, C 1 -C 6 -cyanoalkyl, C 1 -C 6 -haloalkyl, C 3 -C 7 -cycloalkyl, C 3 -C 7 -cycloalkyloxy, C 1 -C 6 -alkoxy, C 1 -C 6 -haloalkoxy, C 2 -C 6 -alkenyl, C 2 -C 6 -haloalkenyl, C 2 -C 6 -alkenyloxy, C 3 -C 6 -alkynyl, C 3 -C 6 -alkynyloxy, C 1 -C 6 -alkylsulfinyl, C 1 -C 6 -alkylsulfonyl, phenyl-C 1 -C 6 -alkyl, amino, C 1 -C 6 -alkylamino or di(C 1 -C 6 -alkyl)amino; or R 11 and R 12, R 25 and R 26, or R 33 and R 34, together with the atoms to which they are attached, form a three- to six-membered cycle, which is saturated, partial unsaturated or aromatic, which may comprise apart from carbon atoms one to four nitrogen atoms, or one or two oxygen atoms, or one or two sulfur atoms, or one to three nitrogen atoms and an oxygen atom, or one to three nitrogen atoms and a sulfur atom, or one sulfur and one oxygen atom, and which for its part may be partially or fully halogenated and/or substituted by one to three radicals from the group consisting of C 1 -C 6 -alkyl and C 1 -C 6 -alkoxy; R 14 and R 15 are hydrogen, halogen or C 1 -C 6 -alkyl; R 19, R 35, R 36 and R 42 are hydrogen, halogen, hydroxy, C 1 -C 6 -alkyl, C 1 -C 6 -haloalkyl, C 3 -C 7 -cycloalkyl, C 3 -C 7 -cycloalkyloxy, C 1 -C 6 -alkoxy, C 1 -C 6 -haloalkoxy, C 1 -C 6 -alkylthio, C 1 -C 6 -haloalkylthio, C 2 -C 6 -alkenyl, C 2 -C 6 -haloalkenyl, C 2 -C 6 -alkenyloxy, C 3 -C 6 -alkynyl or C 3 -C 6 -alkynyloxy; and