This invention concerns compounds useful for the control of insects, especially useful for the control of aphids and other sucking insects. More specifically, the invention concerns compounds of the formula (I) Wherein X represents NO2, CN or COOR<4>; L represents a single bond or R<1>', S and L taken together represent a 5- or 6-membered ring; R<1> represents, methyl or ethyl; R<2> and R<3> independently represent hydrogen, methyl, ethyl, fluoro, chloro or bromo; n is an integer from 0-3.