The present invention relates to insecticidal mixtures of chloronicotinyl insecticides of the formula (I) ##STR00001## in which R.sup.1 represents C.sub.1-C.sub.5-alkyl, R.sup.2 represents hydrogen or C.sub.1-C.sub.5-alkyl or R.sup.1 and R.sup.2 together represent --CH.sub.2--CH.sub.2--; --CH.sub.2--CH.sub.2--CH.sub.2-- or ##STR00002## X represents an NH group, NCH.sub.3 group or represents sulphur, Y represents nitrogen or a CH group and Z represents cyano or nitro, with one or more of the synergists mentioned in the description.