The present invention relates to pyridazine compounds of formulae (I) or (II) and the salts and N-oxides thereof, wherein A is a substituted or unsubstituted isoxazole or isothiazole radical V is C(Rv) or N W is C(Rw) or N with the proviso that either V or W is N Rt, Ru, Rv, Rw are H, halogen, C1-C4-alkyl and the like X1 is S, O or NR1a, wherein R1a is selected H, C1-C10-alkyl and the like X2 is OR2a, NR2bR2c, S(O)mR2d, wherein m is 0, 1 or 2, R2a is C1-C4-alkyl, C1-C4-haloalkyl and the like, R2b, R2c are H, C1-C4-alkyl, C1-C4-haloalkyl and the like, or R2b and R2c together with the nitrogen atom to which they are bound form a heterocycle, and R2d is C1-C4-alkyl, C1-C4-haloalkyl, C3-C6-cycloalkyl and the like and R1 is H, CN, C1-C10-alkyl and the like. The present invention further relates to a method for controlling invertebrate pests, to a method for protecting plant propagation material and/or the plants which grow there- from, to plant propagation material, comprising at least one compound according to the present invention, to a method for treating or protecting an animal from infestation or infection by parasites and to an agricultural composition containing at least one compound according to the present invention.La présente invention a pour objet des composés pyridazine de formules (I) ou (II) et leurs sels et N-oxydes, A étant un radical isoxazole ou isothiazole substitué ou non substitué V étant C(Rv) ou N W étant C(Rw) ou N à condition que V ou bien W soit N Rt, Ru, Rv, Rw étant H, un halogène, un alkyle en C1 à C4 et analogues X1 étant S, O ou NR1a, R1a étant choisi parmi H, un alkyle en C1 à C10 et analogues X2 étant OR2a, NR2bR2c, S(O)mR2d, m étant 0, 1 ou 2, R2a étant un alkyle en C1 à C4, un haloalkyle en C1 à C4 et analogues, R2b, R2c étant H, un alkyle en C1 à C4, un haloalkyle en C1 à C4 et analogues, ou R2b et R2c formant conjointement avec latome dazote auquel ils sont liés un hétérocycle, et R2d étant un alkyle en C1 à C4, un haloalkyle
