Trapping experiments were carried out in Uganda and Indonesia with decyl (E)-2-butenoate and dodecyl (E)-2-butenoate, previously identified as components of the female sex pheromones of the African species of sweetpotato weevil, Cylas puncticollis and C. brunneus, respectively. In Uganda, decyl (E)-2-butenoate attracted only C. puncticollis males, but dodecyl (E)-2-butenoate attracted males of both C. brunneus and C. puncticollis. Catches of C. puncticollis with both compounds were higher when they were dispensed from
