The invention relates to novel pesticidally active N-bisaryl-and N-aryl-cycloalkylidenyl-null-sulfin-and null-sulfonamino acid amides of the general formula I, including the optical isomers thereof and mixtures of such isomers, wherein n is a number zero or one; R1 is C1-C12alkyl; C1-C12alkyl substituted with C1-C4alkoxy, C1-C4alkylthio, C1-C4alkylsulfonyl, C3-C8cycloalkyl, cyano, C1-C6alkoxycarbonyl, C3-C6alkoxycarbonyl, C3-C6alkenyloxycarbonyl or C3-C6alkynyloxycarbonyl; C2-C12alkenyl; C2-C12alkynyl; C1-C12haloalkyl; or a group NR11R12 wherein R11 and R12 are each independently of the other C1-C6alkyl, or together are tetra- or penta-methylene; R2 and R3 ae each independently hydrogen; C1-C8alkyl; C1-C8alkyl substituted with hydroxy, mercapto, C1-C4alkoxy or C1-C4alkylthio; C3-C8alkenyl; C3-C8alkynyl; C3-C8cycloalkyl; C3-C8cycloalkyl-C1-C4alkyl; optionally substituted aryl; optionally substituted heteroaryl; or the two groups R2 and R3 together with the carbon atom to which they are bonded form a three- to eight-membered hydrocarbon ring; A is an optionally substituted saturated or unsaturated C3-C8-cycloalkylidene, optionally substituted phenylidene or optionally substituted saturated or unsaturated heterocyclylidene bridge, R4 and R5 are each independently hydrogen or an organic radicak, and R6 is hydrogen; tri-C1C4alkyl-silyl; di-C1-C4alkyl-phenysilyl; C1-C4alkyl-diphenylsilyl; tri-phenylsilyl; optionally subsituted alkyl; optionally substituted alkenyl or optionally substituted alkynyl. The novel compounds possess plant-protecting properties and are suitable for protecting plants against infestation by phytophathogenic microorganisms. 1