The present invention relates to a novel composition for controlling plant diseases caused by fungal plant pathogens comprising: (a) at least one compound of Formula I, N-oxides and agricuitorally suitable salts thereof wherein A, B, R1, R2, R3 and W are as herein described in the description. and (b) at least one compound selected from the group consisting of (b1) alkylenebis(dithiocarbamate) fungicides (b2) compounds acting at the bc1 complex of the fungal mitochondrial respiratory electron transfer site (b3) cymoxanil (b4) compounds acting at the demethylase enzyme of the sterol biosynthesis pathway (b5) morpholine and piperidine compounds that act on the sterol biosynthesis pathway (b6) phenylamide fungicides (b7) pyrimidinone fungicides (b8) phthalimides and (b9) fosetyl-aluminium
