Pest-combating compositions containing modified volatility pest-control actives are formulated for sustained test-combating efficacy, utilizing oleochemicals subjected to transesterification, methanolysis or conversion of fatty acids to alkyl esters as modified volatility components. In a specific formulation, the pest-combating composition includes soy methyl ester and 2-undecanone. The composition may be constituted as a spray composition, lotion, paste, or other compositional form. Pests that may be usefully combated with such composition include mosquitoes, ticks, cockroaches, thrips, flies, gnats, beetles and aphids.
