Four synthetic acetates and an alcohol were field tested in traps as possible sex attractant inhibitors for the fall armyworm,Spodoptera frugiperda(J. E. Smith). Two of the compounds ((Z)-7-dodecen-1-ol acetate and (Z,E)-9,12-tetradecadien-1-ol acetate) reduced the attraction of males to females 90–100%. These 2 chemicals andZ-9-dodecen-1-ol acetate subsequently were field tested as pheromone-communication disruptants. (Z)-9-dodecen-1-ol acetate and (Z,E)-9,12-tetradecadien-1-ol acetate effected a greater than 85% disruption of communication between males and females when they were evaporated into the atmosphere surrounding calling females. The former compound is a sex attractant of the fall armyworm; the latter is a sex attractant ofPlodia interpunctella(Hübner),S. exigua(Hübner), andS. eridania(Cramer). The use of these compounds to interrupt the normal reproductive cycle of the fall armyworm on an area-wide basis might therefore be feasible.