| abstract |
An insecticidal composition comprising a first insecticidally active ingredient, to which insect pests have developed a degree of resistance, an insecticidally inert carrier or diluent and, optionally, one or more surface active agents, characterised in that the composition further contains a sufficient amount of a compound of formula (I), wherein A represents a bidentate group of formula -CH2CH2- or CH=CH; Ar is phenyl, pyridinyl, pyridazinyl or pyrazinyl, all being optionally substituted with halogen, C1-4 alkyl, C1-4 alkoxy, C2-4 alkenyl, C2-4 alkynyl or cyano; R is hydrogen, C1-4 alkyl (optionally substituted with cyano, CO2(C1-4 alkyl) or phenyl (itself optionally substituted with halogen, C1-4 alkyl, C1-4 alkoxy, C1-4 haloalkyl or C1-4 haloalkoxy)), C2-4 haloalkyl (the α-carbon being unsubstituted), C3-4 alkenyl or C3-4 alkynyl; provided that when R is alkenyl or alkynyl said group does not have an unsaturated carbon atom bonding directly to the ring nitrogen of formula (I); or an acid addition salt, quaternary ammonium salt or N-oxide derived therefrom; to boost the activity of the composition to overcome the resistance of the insect pests; and a method of using such a composition to combat insect pests. |