Chloronicotinyl insecticides having the formula (I), in which the substituents X, A, Z and E have the meanings given in the description, are mixed with synergistic substances from the group of a) isochromane or benzodioxol compound, b) propargyl derivatives, c) azol derivatives, f) pinon esters, g) formamides, h) C12-21-carboxylic acid esters and amides, i) diarylamines, k) cyclic imides, and 1) neem oil.