There are described compounds of formula (I) wherein X.sub.1 and X.sub.2 are each independently of the other fluorine, chlorine or bromine; A.sub.1 and A.sub.2 are, for example, a bond or a C.sub.1-C.sub.6alkylene bridge; A.sub.3 is a C.sub.1-C.sub.6alkylene bridge; R.sub.1 and R.sub.2 are, for example, halogen, OH, SH, CN, nitro, C.sub.1-C.sub.6alkyl, C.sub.1-C.sub.6haloalkyl, C.sub.1-C.sub.6alkyl-carbonyl, C.sub.2-C.sub.6alkenyl, C.sub.2-C.sub.6haloalkenyl or C.sub.3-C.sub.6alkynyl; R,.sub.3 is, for example, H, halogen, OH, SH, CN, nitro, C.sub.1-C.sub.6alkyl or C.sub.1-C.sub.6haloalkyl; R.sub.4 and R.sub.5 are, for example, H, halogen, cyano, nitro, C.sub.1-C.sub.6alkyl or C.sub.1-C.sub.3haloalkyl; m is 1 or 2; Y is, for example, O, S, SO or SO.sub.2; Q is, for example, O, S, SO or SO.sub.2; W is, for example, a bond, O, S, SO, S02, --C(.dbd.O)--O-- or --O--C(.dbd.O)--; T is, for example, a bond, O, S, SO, SO.sub.2, --C(.dbd.O)--O-- or --O--C(.dbd.O)--; and E is aryl unsubstituted or substituted from one to five times or heterocyclyl unsubstituted or, depending upon the possibilities of substitution on the ring, substituted from one to four times; and, where applicable, their possible E/Z isomers, E/Z isomeric mixtures and/or tautomers, in each case in free form or in salt form, a process for the preparation of those compounds and their use, pesticidal compositions in which the active ingredient has been selected from those compounds and agrochemically acceptable salts thereof, a process for the preparation of those compositions and their use, plant propagation material treated with those compositions, and a method of controlling pests.