The present proposals relate to an insecticide or miticide composition which demonstrates low phytotoxicity even at relatively high concentrations combined with highly effective insecticidal and miticidal activity. The composition comprises: a fatty acid/amino acid salt, the fatty acid component comprising: one or more unsaturated fatty acids having from 14 to 22 carbon atoms； and one or more saturated fatty acids having from 8 to 18 carbon atoms； wherein the one or more saturated fatty acids having from 8 to 18 carbon atoms forms at least 15 wt. % of the fatty acid component, and wherein the weight ratio of (unsaturated fatty acids having from 14 to 22 carbon atoms) to (saturated fatty acids having from 8 to 18 carbon atoms) is at least 1. Uses of the compositions and methods of killing insects or mites using the compositions also form part of the proposals.
