Compositions and methods for controlling an arthropod pest population that include an eremophilane sesquiterpene pest control agent (such as, nootkatone or 13-hydroxy-valencene) and a dialkyl-substituted phenol pest control agent (such as, carvacrol) are disclosed. The compounds present in the compositions may be isolated from natural sources, semi-synthesized from naturally occurring compounds, or completely synthesized. The pest control compositions may be applied directly to a pest or the locus of a pest, and function as topical or ingestible pest toxins.