Abstract A water-distilled oil obtained from fresh leaves of A gastache scrophulariaefolia (Lamiaceae) in 0.8% yield was analyzed by capillary GC and GC/MS. The main constituents identified were: limonene (11.4%), menthone (7.6%), isomenthone (49.7%) and (1S) (-) pulegone (19.8%). The oil was shown to exhibit a fumigant effect against the stored grain insect pest Callosobruchus maculatus.