The use of a compound of formula (I) wherein X is (i), (ii) or (iii), formula (i), formula (ii), formula (iii) Y is O, S(O)m, NR3, CR5R6, CR5R6—CR7R8, O—CR7R8, S(O)m—CR7R8, NR3—CR7R8, CR5R6—O, CR5R6—S(O)m, CR5R6—NR3, SO2—NR3, NR3—SO2, NR3—O or O—NR3; m is 0, 1, or 2; the ring (T) formula (T) is a 5- or 6-membered aromatic or heteroaromatic ring; R1 to R10 are specified organic groups and n and is 0, 1, 2, 3 or 4; or salts or N-oxides thereof or compositions containing them in controlling insects, acarines, nematodes or molluscs. Novel compounds are also provided.