The present invention relates to substituted 1,2,5-oxadiazole compounds of formula (I) and N-oxides and salts thereof and compositions containing them. The invention also relates to the use of a 1,2,5-oxadiazole compound or a composition comprising such a compound for controlling unwanted plants. The invention further relates to a method for applying such compounds. In formula I, the variables have the following meanings: R is for example hydrogen, cyano, nitro, halogen, C1-C6-alkyl, C3-C7-cycloalkyl, C3-C7-cycloalkyl-C1-C4-alkyl. , C1-C6-haloalkyl, C2-C6-alkenyl, C2-C6-haloalkenyl, C2-C6-alkynyl, C2-C6-haloalkynyl, C1-C4-alkoxy-C1-C4-alkyl, C1-C4-halo Alkoxy-C1-C4-alkyl, O-Ra, Z-S (O) n-Rb, Z-C (= O) -Rc, Z-C (= O) -ORd, Z-C (= O)- NReRf, Z-NRgRh, Z-phenyl or Z-heterocyclyl； CYC is a bi- or tricyclic group of formula Cyc-1 or Cyc-2 below, and # is the bicycle to the carbonyl group Indicates the point of attachment of the group, Q and Q ′ are independently of each other, for example, a condensed 5, 6, 7, 8, 9 or 10 membered carbocyclic ring or a condensed 5, 6, 7, 8, 9 or 10 R1 is, for example, Z1-cyano, halogen, nitro, C1-C8-alkyl, C2-C8-alkenyl, C2-C8-alkynyl, C1-C8-haloalkyl, C1-C8-alkoxy, C1 -C4-alkoxy-C1-C4-alkyl, Z1-C1-C4-alkoxy-C1-C4-alkoxy, C1-C4-alkylthio-C1-C4-alkyl, Z1-C1-C4-alkylthio-C1-C4-alkylthio , C2-C6-alkenyloxy, C2-C6-alkynyloxy, C1-C6-haloalkoxy, C1-C4-haloalkoxy-C1-C4-al , Z1-C1-C4-haloalkoxy-C1-C4-alkoxy, Z1-S (O) k-R1b, Z1-phenoxy or Z1-heterocyclyloxy； R3 is for example hydrogen, halogen, Z3-OH, Z3-NO2, Z3-cyano, C1-C6-alkyl, C2-C8-alkenyl, C2-C8-alkynyl, Z2-C3-C10-cycloalkyl, Z3-C3-C10-cycloalkoxy, C1-C8-haloalkyl, Z3-C1-C8-alkoxy, Z3-C1-C8-haloalkoxy, Z3-C1-C4-alkoxy-C1-C4-alkoxy, Z3-C1-C4-alkylthio-C1-C4-alkylthio, Z3-C2-C8 -Alkenyloxy, Z3-C2-C8-alkynyloxy, Z3-C1-C8-haloalkoxy, Z 3-C2-C8-haloalkenyloxy, Z3-C2-C8-haloalkynyloxy, Z3-C1-C4-haloalkoxy-C1-C4-alkoxy, Z3- (tri-C1-C4-alkyl) silyl, Z3- S (O) k-R3b, Z3-C (= O) -R3c, Z3-C (= O)-本発明は、
