To provide a herbicidal composition which is highlysafe to crop plants and which is capable of controllingweeds problematic in e.g. paddy fields, upland fields andnon-agricultural fields over a wide range of frompreemergence to postemergence.A herbicidal composition comprising the followingComponent A which is at least one compound selected fromthe group consisting of isoxazoline derivatives of theformula I and their salts, and the following Component B,as active ingredients:Component A:wherein each of R1 and R2 which are independent of eachother, is a hydrogen atom, a C1-C10 alkyl group, a C3-C8cycloalkyl group or a C3-C8 cycloalkyl C1-C3 alkyl group,each of R3 and R4 which are independent of each other, isa hydrogen atom, a C1-C10 alkyl group, a C3-C8 cycloalkylgroup, or R1, R2, R3 and R4 may form a 5- to 8-memberedring together with the carbon atoms to which they arebonded, each of R5 and R6 which are independent of eachother, is a hydrogen atom or a C1-C10 alkyl group, Y is a5- or 6-membered aromatic heterocyclic or aromaticcondensed heterocyclic group having an optional hetero89atom selected from the group consisting of a nitrogenatom, an oxygen atom and a sulfur atom,Component B:Imazaquin, diuron, sulfentrazone, sulcotrione,norflurazon, clomazone, dimethenamid-P, prosulfocarb,isoproturon, trifluralin or triallate.
